Consolidated Schedule of Investments £ in Thousands, $ in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2022 GBP (£)	Dec. 31, 2021 CAD ($)	Dec. 31, 2020 USD ($)
Schedule of Investments [Line Items]
Investments, amortized cost	$ 773,406	$ 831,960
Investments, at fair value	$ 764,554	$ 819,208
Percent of net assets	222.86%	234.24%	222.86%	222.86%	234.24%
PIK interest rate		1.50%			1.50%
Qualifying Assets Required Of Acquiree At Time Of Acquisition Of Total Assets	70.00%	70.00%
Qualifying Assets Of Acquired Of Total Assets	82.40%	88.20%
Investments Of Net Assets	222.90%	234.20%
Investment Of Total Assets	96.00%	96.30%
Additional interest for senior term debt		2.75%
Additional Interest For Senior Term Debt		3.50%
Additional interest for senior term debt		3.00%
Interest Issuer May Pay In Cash Or Cash And PIK.		2.00%
Interest Investment Earns When Converted On Annual Basis		14.00%
One-month LIBOR		0.10%
Three-month LIBOR		0.21%
Six-month LIBOR		0.34%
SOFR		0.05%
CDOR		0.52%
Canadian prime		2.45%
Prime		3.25%
Unrealized appreciation	$ 10
Morgan Stanley
Schedule of Investments [Line Items]
Unrealized appreciation	$ 10
Morgan Stanley | CAD
Schedule of Investments [Line Items]
Currency to be sold	199
Morgan Stanley | USD
Schedule of Investments [Line Items]
Currency to be purchased	155
Advertising
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 9,763
Investments, at fair value	$ 9,782
Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 3,531
Investments, at fair value	$ 3,557
Application Software
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,183	$ 13,247
Investments, at fair value	$ 13,411	$ 13,518
Building Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,125	$ 16,441
Investments, at fair value	$ 14,305	$ 16,603
Construction & Engineering
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,534	$ 13,626
Investments, at fair value	$ 8,625	$ 13,975
Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,497	$ 15,766
Investments, at fair value	$ 14,507	$ 16,160
Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,302	$ 12,773
Investments, at fair value	$ 11,741	$ 10,489
Electronic Equipment & Instruments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,564	$ 6,680
Investments, at fair value	$ 13,485	$ 6,687
Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,577	$ 6,780
Investments, at fair value	$ 18,641	$ 6,872
Household Appliances
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,325
Investments, at fair value	$ 7,773
Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,168	$ 6,727
Investments, at fair value	$ 15,276	$ 6,815
Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,901	$ 15,153
Investments, at fair value	$ 19,114	$ 15,353
Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 5,643	$ 9,943
Investments, at fair value	$ 5,687	$ 10,054
IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 34,933	$ 40,384
Investments, at fair value	$ 33,342	$ 40,697
Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,945	$ 8,931
Investments, at fair value	$ 9,044	$ 8,930
Packaged Foods & Meats
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,297	$ 26,802
Investments, at fair value	$ 11,998	$ 25,606
Personal Products
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 3,639	$ 4,185
Investments, at fair value	$ 3,698	$ 4,273
Real Estate Operating Companies
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 10,777	$ 4,781
Investments, at fair value	$ 10,722	$ 4,780
Research & Consulting Services
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,799	$ 8,852
Investments, at fair value	$ 8,832	$ 8,901
Systems Software
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 9,801
Investments, at fair value		$ 9,898
Technology Hardware, Storage & Peripherals
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,899	$ 14,694
Investments, at fair value	$ 14,991	14,725
Debt Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 727,213	794,969
Investments, at fair value	$ 716,495	$ 781,049
Percent of net assets	208.83%	223.32%	208.83%	208.83%	223.32%
Debt Investments | Advertising
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 9,490
Investments, at fair value		$ 9,488
Percent of net assets		2.71%			2.71%
Debt Investments | Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,655	$ 20,021
Investments, at fair value	$ 15,440	$ 20,129
Percent of net assets	4.50%	5.75%	4.50%	4.50%	5.75%
Debt Investments | Alternative Carriers
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,040
Investments, at fair value	$ 11,993
Percent of net assets	3.50%		3.50%	3.50%
Debt Investments | Application Software
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 20,674	$ 22,460
Investments, at fair value	$ 18,145	$ 22,590
Percent of net assets	5.28%	6.46%	5.28%	5.28%	6.46%
Debt Investments | Asset Management & Custody Banks
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 10,108
Investments, at fair value	$ 10,169
Percent of net assets	2.97%		2.97%	2.97%
Debt Investments | Automotive Retail
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,532	$ 15,193
Investments, at fair value	$ 14,594	$ 15,286
Percent of net assets	4.25%	4.37%	4.25%	4.25%	4.37%
Debt Investments | Broadcasting
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,052	$ 8,027
Investments, at fair value	$ 7,942	$ 8,027
Percent of net assets	2.32%	2.30%	2.32%	2.32%	2.30%
Debt Investments | Building Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 26,714	$ 43,653
Investments, at fair value	$ 24,714	$ 43,757
Percent of net assets	7.20%	12.51%	7.20%	7.20%	12.51%
Debt Investments | Cable & Satellite
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,891	$ 14,936
Investments, at fair value	$ 14,323	$ 14,526
Percent of net assets	4.18%	4.15%	4.18%	4.18%	4.15%
Debt Investments | Commodity Chemicals
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 15,777	$ 15,047
Investments, at fair value	$ 16,003	$ 15,172
Percent of net assets	4.67%	4.34%	4.67%	4.67%	4.34%
Debt Investments | Construction & Engineering
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 10,814
Investments, at fair value		$ 11,086
Percent of net assets		3.17%			3.17%
Debt Investments | Construction Materials
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,402	$ 7,725
Investments, at fair value	$ 8,168	$ 7,673
Percent of net assets	2.37%	2.20%	2.37%	2.37%	2.20%
Debt Investments | Consumer Finance
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 9,455
Investments, at fair value		$ 9,628
Percent of net assets		2.76%			2.76%
Debt Investments | Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 39,673	$ 31,301
Investments, at fair value	$ 41,019	$ 31,971
Percent of net assets	11.96%	9.14%	11.96%	11.96%	9.14%
Debt Investments | Department Stores
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 13,331
Investments, at fair value		$ 13,538
Percent of net assets		3.87%			3.87%
Debt Investments | Distributors
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 5,326	$ 4,949
Investments, at fair value	$ 3,618	$ 4,025
Percent of net assets	1.05%	1.15%	1.05%	1.05%	1.15%
Debt Investments | Diversified Chemicals
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,867	$ 18,643
Investments, at fair value	$ 13,941	$ 18,360
Percent of net assets	4.06%	5.25%	4.06%	4.06%	5.25%
Debt Investments | Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 11,264	$ 11,459
Investments, at fair value	$ 11,165	$ 11,460
Percent of net assets	3.25%	3.28%	3.25%	3.25%	3.28%
Debt Investments | Education Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,315	$ 13,235
Investments, at fair value	$ 13,285	$ 13,231
Percent of net assets	3.87%	3.79%	3.87%	3.87%	3.79%
Debt Investments | Electric Utilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 10,331	$ 10,299
Investments, at fair value	$ 10,408	$ 10,296
Percent of net assets	3.03%	2.94%	3.03%	3.03%	2.94%
Debt Investments | Electronic Equipment & Instruments
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 6,684
Investments, at fair value		$ 6,687
Percent of net assets		1.91%			1.91%
Debt Investments | Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,251	$ 32,174
Investments, at fair value	$ 18,108	$ 32,173
Percent of net assets	5.28%	9.20%	5.28%	5.28%	9.20%
Debt Investments | Health Care Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investments, amortized cost	$ 10,392	$ 36,949
Investments, at fair value	$ 10,318	$ 25,576
Percent of net assets	3.01%	7.31%	3.01%	3.01%	7.31%
Debt Investments | Health Care Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 33,516	$ 57,609
Investments, at fair value	$ 32,756	$ 57,037
Percent of net assets	9.56%	16.30%	9.56%	9.56%	16.30%
Debt Investments | Health Care Supplies
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 23,199
Investments, at fair value	$ 23,354
Percent of net assets	6.80%		6.80%	6.80%
Debt Investments | Heavy Electrical Equipment
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 14,045	$ 11,027
Investments, at fair value	$ 13,897	$ 11,088
Percent of net assets	4.05%	3.17%	4.05%	4.05%	3.17%
Debt Investments | Home Furnishings
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 25,404	$ 24,479
Investments, at fair value	$ 25,311	$ 24,017
Percent of net assets	7.37%	6.87%	7.37%	7.37%	6.87%
Debt Investments | Household Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 11,897	$ 11,637
Investments, at fair value	$ 11,414	$ 11,773
Percent of net assets	3.32%	3.36%	3.32%	3.32%	3.36%
Debt Investments | Household Appliances
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 6,040
Investments, at fair value	$ 6,003
Percent of net assets	1.75%		1.75%	1.75%
Debt Investments | Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 7,521
Investments, at fair value	$ 7,541
Percent of net assets	2.20%		2.20%	2.20%
Debt Investments | Interactive Media & Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,006	$ 18,609
Investments, at fair value	$ 7,933	$ 18,759
Percent of net assets	2.31%	5.36%	2.31%	2.31%	5.36%
Debt Investments | Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 37,285	$ 41,910
Investments, at fair value	$ 37,542	$ 42,440
Percent of net assets	10.95%	12.13%	10.95%	10.95%	12.13%
Debt Investments | Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 12,043	$ 12,674
Investments, at fair value	$ 12,077	$ 12,729
Percent of net assets	3.52%	3.64%	3.52%	3.52%	3.64%
Debt Investments | IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,649	$ 17,679
Investments, at fair value	$ 13,653	$ 17,694
Percent of net assets	3.98%	5.06%	3.98%	3.98%	5.06%
Debt Investments | Leisure Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 22,075	$ 22,020
Investments, at fair value	$ 21,868	$ 21,878
Percent of net assets	6.37%	6.26%	6.37%	6.37%	6.26%
Debt Investments | Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember	Non-controlled/non-affiliate company investments	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 3,565	$ 6,115
Investments, at fair value	$ 3,509	$ 3,072
Percent of net assets	1.02%	0.88%	1.02%	1.02%	0.88%
Debt Investments | Life Sciences Tools & Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 4,932	$ 4,925
Investments, at fair value	$ 4,912	$ 4,925
Percent of net assets	1.43%	1.41%	1.43%	1.43%	1.41%
Debt Investments | Office Services & Supplies
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 26,109	$ 20,832
Investments, at fair value	$ 25,039	$ 20,921
Percent of net assets	7.30%	5.98%	7.30%	7.30%	5.98%
Debt Investments | Packaged Foods & Meats
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 11,175	$ 11,084
Investments, at fair value	$ 10,922	$ 10,862
Percent of net assets	3.19%	3.11%	3.19%	3.19%	3.11%
Debt Investments | Personal Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 13,703	$ 12,055
Investments, at fair value	$ 13,566	$ 12,260
Percent of net assets	3.96%	3.50%	3.96%	3.96%	3.50%
Debt Investments | Paper Packaging
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 8,099
Investments, at fair value	$ 8,099
Percent of net assets	2.35%		2.35%	2.35%
Debt Investments | Real Estate Operating Companies
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 5,425
Investments, at fair value		$ 5,431
Percent of net assets		1.56%			1.56%
Debt Investments | Research & Consulting Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 22,244	$ 23,987
Investments, at fair value	$ 22,316	$ 23,822
Percent of net assets	6.50%	6.81%	6.50%	6.50%	6.81%
Debt Investments | Specialized Consumer Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 36,993	$ 35,322
Investments, at fair value	$ 37,096	$ 35,385
Percent of net assets	10.82%	10.11%	10.82%	10.82%	10.11%
Debt Investments | Specialized Finance
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 80,000	$ 60,000
Investments, at fair value	$ 80,000	$ 60,000
Percent of net assets	23.32%	17.16%	23.32%	23.32%	17.16%
Debt Investments | Systems Software
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 18,970	$ 19,018
Investments, at fair value	$ 17,525	$ 19,160
Percent of net assets	5.11%	5.48%	5.11%	5.11%	5.48%
Debt Investments | Technology Hardware, Storage & Peripherals
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 16,479	$ 22,717
Investments, at fair value	$ 16,809	$ 23,117
Percent of net assets	4.90%	6.61%	4.90%	4.90%	6.61%
Subordinated Debt [Member]
Schedule of Investments [Line Items]
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 167	167
Equity Investments
Schedule of Investments [Line Items]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 46,193	36,991
Investments, at fair value	$ 48,059	$ 38,159
Percent of net assets	14.03%	10.92%	14.03%	14.03%	10.92%
Equity Investments | Advertising
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 251	$ 250
Investments, at fair value	$ 219	$ 250
Percent of net assets	0.06%	0.07%	0.06%	0.06%	0.07%
Equity Investments | Air Freight & Logistics
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 1,250	$ 1,250
Investments, at fair value	$ 606	$ 1,250
Percent of net assets	0.18%	0.36%	0.18%	0.18%	0.36%
Equity Investments | Building Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 423
Investments, at fair value	$ 603
Percent of net assets	0.18%		0.18%	0.18%
Equity Investments | Data Processing & Outsourced Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 476	$ 423
Investments, at fair value	$ 2,368				$ 427
Percent of net assets	0.69%	0.12%	0.69%	0.69%	0.12%
Equity Investments | Data Processing And Outsourced Services Acquired on 120420
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 476
Investments, at fair value		$ 893
Percent of net assets		0.26%			0.26%
Equity Investments | Diversified Support Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 333	$ 317
Investments, at fair value	$ 144	$ 158
Percent of net assets	0.04%	0.05%	0.04%	0.04%	0.05%
Equity Investments | Education Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 118	$ 167
Percent of net assets	0.03%	0.05%	0.03%	0.03%	0.05%
Equity Investments | Environmental & Facilities Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 825	$ 825
Investments, at fair value	$ 661	$ 825
Percent of net assets	0.19%	0.24%	0.19%	0.19%	0.24%
Equity Investments | Health Care Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investments, amortized cost		$ 857
Investments, at fair value		$ 1,018
Percent of net assets		0.29%			0.29%
Equity Investments | Industrial Machinery
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 667
Investments, at fair value	$ 668
Percent of net assets	0.19%		0.19%	0.19%
Equity Investments | Interactive Media & Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 851	$ 850
Investments, at fair value	$ 2,327	$ 1,398
Percent of net assets	0.68%	0.40%	0.68%	0.68%	0.40%
Equity Investments | Internet & Direct Marketing Retail
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 1,614	$ 1,700
Investments, at fair value	$ 2,770	$ 3,228
Percent of net assets	0.81%	0.92%	0.81%	0.81%	0.92%
Equity Investments | Investment Banking & Brokerage
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 6,944	$ 6,944
Investments, at fair value	$ 6,295	$ 6,874
Percent of net assets	1.84%	1.97%	1.84%	1.84%	1.97%
Equity Investments | IT Consulting And Other Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 1,468	$ 1,468
Investments, at fair value	$ 1,818	$ 1,468
Percent of net assets	0.53%	0.42%	0.53%	0.53%	0.42%
Equity Investments | Leisure Facilities
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 2,734	$ 2,734
Investments, at fair value	$ 221	$ 264
Percent of net assets	0.07%	0.07%	0.07%	0.07%	0.07%
Equity Investments | Leisure Products
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 4,060
Investments, at fair value	$ 2,099
Percent of net assets	0.62%		0.62%	0.62%
Equity Investments | Other Diversified Financial Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 2,890	$ 2,890
Investments, at fair value	$ 3,823	$ 3,492
Percent of net assets	1.11%	1.00%	1.11%	1.11%	1.00%
Equity Investments | Paper Packaging
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 400
Investments, at fair value	$ 400
Percent of net assets	0.12%		0.12%	0.12%
Equity Investments | Specialized Consumer Services
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 840	$ 840
Investments, at fair value	$ 853	$ 840
Percent of net assets	0.26%	0.24%	0.26%	0.26%	0.24%
Equity Investments | Specialized Finance
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investments, amortized cost	$ 20,000	$ 15,000
Investments, at fair value	$ 22,066	$ 15,607
Percent of net assets	6.43%	4.46%	6.43%	6.43%	4.46%
Non-controlled/non-affiliate company investments
Schedule of Investments [Line Items]
Investments, at fair value	$ 650,585	$ 736,727
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ABBCon-ciseOpticalGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Supplies		Health Care Supplies	Health Care Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember		us-gaap:BaseRateMember	us-gaap:BaseRateMember
Floor	0.75%		0.75%	0.75%
Spread Above Index	6.51%		6.51%	6.51%
Interest Rate	12.72%		12.72%	12.72%
Acquisition Date	Feb. 23, 2022
Maturity Date	Feb. 23, 2028		Feb. 23, 2028	Feb. 23, 2028
Investments, amortized cost	$ 2,058
Investments, at fair value	$ 2,073
Percent of net assets	0.60%		0.60%	0.60%
Principal/Share Amount	$ 2,106
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: ABB/Con-cise Optical Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ABBCon-ciseOpticalGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Supplies		Health Care Supplies	Health Care Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.75%		0.75%	0.75%
Spread Above Index	7.50%		7.50%	7.50%
Interest Rate	10.46%		10.46%	10.46%
Acquisition Date	Feb. 23, 2022
Maturity Date	Feb. 23, 2028		Feb. 23, 2028	Feb. 23, 2028
Investments, amortized cost	$ 21,141
Investments, at fair value	$ 21,281
Percent of net assets	6.20%		6.20%	6.20%
Principal/Share Amount	$ 21,627
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: ALM Media, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ALMMediaLLCMember	whf:ALMMediaLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	7.00%	6.50%	6.50%	7.00%
Interest Rate	9.31%	8.00%	9.31%	9.31%	8.00%
Acquisition Date	Nov. 25, 2019	Nov. 25, 2019
Maturity Date	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024	Nov. 25, 2024
Investments, amortized cost	$ 13,467	$ 14,011
Investments, at fair value	$ 13,458	$ 13,996
Percent of net assets	3.92%	4.00%	3.92%	3.92%	4.00%
Principal/Share Amount	$ 13,584	$ 14,175
PIK interest rate		1.00%			1.00%
Investment, interest rate, paid in cash		10.25%			10.25%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: AST Applications Software Technology LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:ASTApplicationsSoftwareTechnologyLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		8.00%			8.00%
Interest Rate		9.00%			9.00%
Acquisition Date		Jan. 10, 2017
Maturity Date		Jan. 10, 2023			Jan. 10, 2023
Investments, amortized cost		$ 3,943
Investments, at fair value		$ 3,958
Percent of net assets		1.13%			1.13%
Principal/Share Amount		$ 3,958
PIK interest rate		1.00%			1.00%
Investment, interest rate, paid in cash		8.00%			8.00%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: ATSG Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ATSGIncMember	whf:ATSGIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.42%	7.50%	9.42%	9.42%	7.50%
Acquisition Date	Nov. 12, 2021	Nov. 12, 2021
Maturity Date	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026	Nov. 12, 2026
Investments, amortized cost	$ 13,649	$ 13,736
Investments, at fair value	$ 13,653	$ 13,736
Percent of net assets	3.98%	3.93%	3.98%	3.98%	3.93%
Principal/Share Amount	$ 13,877	$ 14,008
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Access USA Shipping, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AccessUSAShippingLLCMember	whf:AccessUSAShippingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	8.00%	8.00%	8.00%	8.00%	8.00%
Interest Rate	11.12%	9.50%	11.12%	11.12%	9.50%
Acquisition Date	Feb. 08, 2019	Feb. 08, 2019
Maturity Date	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024	Feb. 08, 2024
Investments, amortized cost	$ 4,699	$ 4,906
Investments, at fair value	$ 4,718	$ 4,937
Percent of net assets	1.38%	1.41%	1.38%	1.38%	1.41%
Principal/Share Amount	$ 4,718	$ 4,937
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Aeyon LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AeyonLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services		Research & Consulting Services	Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	8.88%		8.88%	8.88%
Interest Rate	11.62%		11.62%	11.62%
Acquisition Date	Feb. 10, 2022
Maturity Date	Feb. 10, 2027		Feb. 10, 2027	Feb. 10, 2027
Investments, amortized cost	$ 8,777
Investments, at fair value	$ 8,858
Percent of net assets	2.58%		2.58%	2.58%
Principal/Share Amount	$ 8,933
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AmericanCraftsLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies		Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	8.50%		8.50%	8.50%
Interest Rate	11.62%		11.62%	11.62%
Acquisition Date	Jan. 25, 2022
Maturity Date	May 28, 2026		May 28, 2026	May 28, 2026
Investments, amortized cost	$ 1,344
Investments, at fair value	$ 1,195
Percent of net assets	0.35%		0.35%	0.35%
Principal/Share Amount	$ 1,367
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: American Crafts, LC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AmericanCraftsLCMember	whf:AmericanCraftsLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.50%	8.50%	8.50%	8.50%	8.50%
Interest Rate	11.62%	9.50%	11.62%	11.62%	9.50%
Acquisition Date	May 28, 2021	May 28, 2021
Maturity Date	May 28, 2026	May 28, 2026	May 28, 2026	May 28, 2026	May 28, 2026
Investments, amortized cost	$ 8,050	$ 8,325
Investments, at fair value	$ 7,114	$ 8,325
Percent of net assets	2.07%	2.38%	2.07%	2.07%	2.38%
Principal/Share Amount	$ 8,139	$ 8,434
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Arcole Holding Corporation Shares
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:ArcoleHoldingCorporationMember	whf:ArcoleHoldingCorporationMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Acquisition Date	Oct. 01, 2020	Oct. 01, 2020
Investments, amortized cost	$ 6,944	$ 6,944
Investments, at fair value	$ 6,295	$ 6,874				$ 6,448
Percent of net assets	1.84%	1.97%	1.84%	1.84%	1.97%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Arcstor Midco, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ArcstorMidcoLLCMember	whf:ArcstorMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Systems Software	Systems Software	Systems Software	Systems Software	Systems Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	7.00%	7.00%	7.00%	7.00%
Interest Rate	10.67%	8.00%	10.67%	10.67%	8.00%
Acquisition Date	Mar. 16, 2021	Mar. 16, 2021
Maturity Date	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027	Mar. 16, 2027
Investments, amortized cost	$ 18,970	$ 19,018
Investments, at fair value	$ 17,525	$ 19,160
Percent of net assets	5.11%	5.48%	5.11%	5.11%	5.48%
Principal/Share Amount	$ 19,256	$ 19,354
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Atlas Purchaser, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AtlasPurchaserIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software		Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.75%		0.75%	0.75%
Spread Above Index	5.25%		5.25%	5.25%
Interest Rate	8.68%		8.68%	8.68%
Acquisition Date	Aug. 29, 2022
Maturity Date	May 08, 2028		May 08, 2028	May 08, 2028
Investments, amortized cost	$ 2,595
Investments, at fair value	$ 2,562
Percent of net assets	0.74%		0.74%	0.74%
Principal/Share Amount	$ 3,105
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Atlas Purchaser, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AtlasPurchaserIncMember	whf:AtlasPurchaserIncMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.75%	0.75%	0.75%	0.75%	0.75%
Spread Above Index	9.00%	9.00%	9.00%	9.00%	9.00%
Interest Rate	11.19%	9.75%	11.19%	11.19%	9.75%
Acquisition Date	May 03, 2021	May 03, 2021
Maturity Date	May 07, 2029	May 07, 2029	May 07, 2029	May 07, 2029	May 07, 2029
Investments, amortized cost	$ 14,628	$ 14,586
Investments, at fair value	$ 12,197	$ 14,700
Percent of net assets	3.55%	4.20%	3.55%	3.55%	4.20%
Principal/Share Amount	$ 15,000	$ 15,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Avision Holdings, LLC Class A LLC Interests
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:AvisionHoldingsLLCMember	whf:AvisionHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember	whf:ClassALLCInterestsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising	Advertising	Advertising	Advertising	Advertising
Acquisition Date	Dec. 15, 2021	Dec. 15, 2021
Investments, amortized cost	$ 251	$ 250
Investments, at fair value	$ 219	$ 250
Percent of net assets	0.06%	0.07%	0.06%	0.06%	0.07%
Principal/Share Amount	$ 201	$ 200
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10.00%	10.00%	10.00%	10.00%	10.00%
Interest Rate	13.12%	11.50%	13.12%	13.12%	11.50%
Acquisition Date	Apr. 29, 2022	Dec. 02, 2021
Maturity Date	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025
Investments, amortized cost	$ 2,553	$ 2,523
Investments, at fair value	$ 2,559	$ 2,523
Percent of net assets	0.75%	0.72%	0.75%	0.75%	0.72%
Principal/Share Amount	$ 2,593	$ 2,573
PIK interest rate	2.00%	2.00%	2.00%	2.00%	2.00%
Investment, interest rate, paid in cash	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: BBQ Buyer, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10.00%	10.00%	10.00%	10.00%	10.00%
Interest Rate	13.12%	11.50%	13.12%	13.12%	11.50%
Acquisition Date	Aug. 28, 2020	Aug. 28, 2020
Maturity Date	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025	Aug. 28, 2025
Investments, amortized cost	$ 12,533	$ 12,388
Investments, at fair value	$ 12,616	$ 12,623
Percent of net assets	3.68%	3.61%	3.68%	3.68%	3.61%
Principal/Share Amount	$ 12,719	$ 12,623
PIK interest rate	2.00%	2.00%	2.00%	2.00%	2.00%
Investment, interest rate, paid in cash	11.12%	9.50%	11.12%	11.12%	9.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: BBQ Buyer, LLC Shares
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BBQBuyerLLCMember	whf:BBQBuyerLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Acquisition Date	Aug. 28, 2020	Aug. 28, 2020
Investments, amortized cost	$ 1,100	$ 1,100
Investments, at fair value	$ 1,954	$ 2,442
Percent of net assets	0.57%	0.70%	0.57%	0.57%	0.70%
Principal/Share Amount	$ 1,100	$ 1,100
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: BL Products Parent, LP Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember		whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Acquisition Date	Feb. 01, 2022
Investments, amortized cost	$ 667
Investments, at fair value	$ 668
Percent of net assets	0.19%		0.19%	0.19%
Principal/Share Amount	$ 667
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	false		false	false
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.44%, Due 2/1/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	9.00%		9.00%	9.00%
Acquisition Date	Feb. 18, 2022
Maturity Date	Feb. 01, 2027		Feb. 01, 2027	Feb. 01, 2027
Investments, amortized cost	$ 269
Investments, at fair value	271
Principal/Share Amount	$ 274
Investment, Identifier [Axis]: BLP Buyer, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.54%, Due 2/1/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:BLProductsParentLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	9.03%		9.03%	9.03%
Acquisition Date	Feb. 18, 2022
Maturity Date	Feb. 01, 2027		Feb. 01, 2027	Feb. 01, 2027
Investments, amortized cost	$ 8,066
Investments, at fair value	8,080
Principal/Share Amount	$ 8,209
Investment, Identifier [Axis]: BPII-JL Group Holdings LP Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BPII-JLGroupHoldingsLPMember	whf:BPII-JLGroupHoldingsLPMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Acquisition Date	Dec. 29, 2021	Dec. 29, 2021
Investments, amortized cost	$ 825	$ 825
Investments, at fair value	$ 661	$ 825
Percent of net assets	0.19%	0.24%	0.19%	0.19%	0.24%
Principal/Share Amount	$ 83	$ 83
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.75%	7.75%	7.75%	7.75%	7.75%
Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investments, at fair value	$ (11)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.75%	7.75%	7.75%	7.75%	7.75%
Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investments, at fair value	$ (8)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Bridgepoint Healthcare, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BridgepointHealthcareLLCMember	whf:BridgepointHealthcareLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities	Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.75%	7.75%	7.75%	7.75%	7.75%
Interest Rate	10.51%	8.75%	10.51%	10.51%	8.75%
Acquisition Date	Oct. 05, 2021	Oct. 05, 2021
Maturity Date	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026	Oct. 05, 2026
Investments, amortized cost	$ 10,392	$ 10,770
Investments, at fair value	$ 10,337	$ 10,769
Percent of net assets	3.01%	3.08%	3.01%	3.01%	3.08%
Principal/Share Amount	$ 10,562	$ 10,979
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Bulk Midco, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:BulkMidcoLLCMember	whf:BulkMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Cable & Satellite	Cable & Satellite	Cable & Satellite	Cable & Satellite	Cable & Satellite
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.25%	7.24%	5.25%	5.25%	7.24%
Interest Rate	11.50%	8.24%	11.50%	11.50%	8.24%
Acquisition Date	Jun. 08, 2018	Jun. 08, 2018
Maturity Date	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023	Jun. 08, 2023
Investments, amortized cost	$ 14,891	$ 14,936
Investments, at fair value	$ 14,323	$ 14,526
Percent of net assets	4.18%	4.15%	4.18%	4.18%	4.15%
Principal/Share Amount	$ 14,922	$ 15,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional interest for senior term debt	2.75%
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	9.00%	9.00%	9.00%	9.00%	9.00%
Interest Rate	12.67%	10.50%	12.67%	12.67%	10.50%
Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Maturity Date	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024
Investments, amortized cost	$ 7,079	$ 7,175
Investments, at fair value	$ 7,125	$ 7,242
Percent of net assets	2.08%	2.07%	2.08%	2.08%	2.07%
Principal/Share Amount	$ 7,125	$ 7,242
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	12.17%	10.00%	12.17%	12.17%	10.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: CHS Therapy, LLC First Lien Secured Term Loan C
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CHSTherapyLLCMember	whf:CHSTherapyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	9.00%	9.00%	9.00%	9.00%	9.00%
Interest Rate	12.67%	10.50%	12.67%	12.67%	10.50%
Acquisition Date	Oct. 07, 2020	Oct. 07, 2020
Maturity Date	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024	Jun. 14, 2024
Investments, amortized cost	$ 869	$ 879
Investments, at fair value	$ 877	$ 891
Percent of net assets	0.26%	0.25%	0.26%	0.26%	0.25%
Principal/Share Amount	$ 877	$ 891
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	12.17%	10.00%	12.17%	12.17%	10.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: CX Holdco LLC Common Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CXHoldcoLLCMember	whf:CXHoldcoLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Acquisition Date	May 04, 2021	May 04, 2021
Investments, amortized cost	$ 972	$ 972
Investments, at fair value	$ 1,457	$ 972
Percent of net assets	0.42%	0.28%	0.42%	0.42%	0.28%
Principal/Share Amount	$ 972	$ 972
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.55%	7.50%	9.55%	9.55%	7.50%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Maturity Date	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027
Investments, at fair value	$ (24)	$ (1)
Percent of net assets	(0.01%)		(0.01%)	(0.01%)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Specialized Consumer Services			Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Nov. 16, 2021
Maturity Date		Nov. 16, 2027			Nov. 16, 2027
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Camp Facility Services Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesHoldingsLLCMember	whf:CampFacilityServicesHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.55%	7.50%	9.55%	9.55%	7.50%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Maturity Date	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027	Nov. 16, 2027
Investments, amortized cost	$ 11,628	$ 12,745
Investments, at fair value	$ 11,558	$ 12,742
Percent of net assets	3.37%	3.64%	3.37%	3.37%	3.64%
Principal/Share Amount	$ 11,830	$ 13,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Camp Facility Services Parent, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CampFacilityServicesParentLLCMember	whf:CampFacilityServicesParentLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Spread Above Index	10.00%	10.00%	10.00%	10.00%	10.00%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Investments, amortized cost	$ 840	$ 840
Investments, at fair value	$ 853	$ 840
Percent of net assets	0.26%	0.24%	0.26%	0.26%	0.24%
Principal/Share Amount	$ 15	$ 15
PIK interest rate	10.00%	10.00%	10.00%	10.00%	10.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: Cennox Holdings Limited, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	7.69%	7.00%	7.69%	7.69%	7.00%
Acquisition Date	Jul. 16, 2021	Jul. 16, 2021
Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investments, amortized cost	$ 3,868	$ 3,889
Investments, at fair value	3,140	3,877
Principal/Share Amount	$ 2,844	$ 2,866
Investment, Identifier [Axis]: Cennox Holdings Limited, First lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxHoldingsLimitedMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.00%	6.25%	6.25%	6.00%
Interest Rate	9.78%	7.00%	9.78%	9.78%	7.00%
Acquisition Date	Jun. 28, 2022	Jul. 16, 2021
Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investments, amortized cost	$ 9,845	$ 1,173
Investments, at fair value	9,205	1,169
Principal/Share Amount	$ 9,482	$ 864
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Jun. 28, 2021
Maturity Date		May 04, 2026			May 04, 2026
Investments, amortized cost		$ 8,755
Investments, at fair value		8,915
Principal/Share Amount		$ 8,915
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:CennoxHoldingsLimitedMember	whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	8.03%	7.00%	8.03%	8.03%	7.00%
Acquisition Date	Jul. 16, 2021	Jun. 28, 2021
Maturity Date	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026	May 04, 2026
Investments, amortized cost	$ 680	$ 551
Investments, at fair value	502	569
Principal/Share Amount	$ 450	$ 561
Investment, Identifier [Axis]: Cennox, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 5/4/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:CennoxInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		IT Consulting And Other Services			IT Consulting And Other Services
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Jun. 28, 2021
Maturity Date		May 04, 2026			May 04, 2026
Investments, amortized cost		$ 8,365
Investments, at fair value		8,438
Principal/Share Amount		$ 8,525
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction Materials	Construction Materials	Construction Materials	Construction Materials	Construction Materials
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	us-gaap:PrimeRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:PrimeRateMember
Floor	1.00%	3.25%	1.00%	1.00%	3.25%
Spread Above Index	5.72%	5.50%	5.72%	5.72%	5.50%
Interest Rate	11.84%	8.75%	11.84%	11.84%	8.75%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025
Investments, amortized cost	$ 918	$ 207
Investments, at fair value	$ 888	$ 204
Percent of net assets	0.26%	0.06%	0.26%	0.26%	0.06%
Principal/Share Amount	$ 926	$ 211
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Claridge Products and Equipment, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ClaridgeProductsandEquipmentLLCMember	whf:ClaridgeProductsandEquipmentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction Materials	Construction Materials	Construction Materials	Construction Materials	Construction Materials
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.17%	7.50%	10.17%	10.17%	7.50%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025	Dec. 29, 2025
Investments, amortized cost	$ 7,484	$ 7,518
Investments, at fair value	$ 7,280	$ 7,469
Percent of net assets	2.11%	2.14%	2.11%	2.11%	2.14%
Principal/Share Amount	$ 7,582	$ 7,640
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: CleanChoice Energy, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CleanChoiceEnergyIncMember	whf:CleanChoiceEnergyIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electric Utilities	Electric Utilities	Electric Utilities	Electric Utilities	Electric Utilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	9.76%	8.25%	9.76%	9.76%	8.25%
Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investments, amortized cost	$ 10,331	$ 10,299
Investments, at fair value	$ 10,408	$ 10,296
Percent of net assets	3.03%	2.94%	3.03%	3.03%	2.94%
Principal/Share Amount	$ 10,500	$ 10,500
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Broadcasting	Broadcasting	Broadcasting	Broadcasting	Broadcasting
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.48%	7.50%	9.48%	9.48%	7.50%
Acquisition Date	Dec. 30, 2021	Dec. 30, 2021
Maturity Date	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026
Investments, at fair value	$ (4)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Coastal Television Broadcasting Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CoastalTelevisionBroadcastingGroupLLCMember	whf:CoastalTelevisionBroadcastingGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Broadcasting	Broadcasting	Broadcasting	Broadcasting	Broadcasting
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.48%	7.50%	9.48%	9.48%	7.50%
Acquisition Date	Dec. 30, 2021	Dec. 30, 2021
Maturity Date	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026	Dec. 30, 2026
Investments, amortized cost	$ 8,052	$ 8,027
Investments, at fair value	$ 7,946	$ 8,027
Percent of net assets	2.32%	2.30%	2.32%	2.32%	2.30%
Principal/Share Amount	$ 8,191	$ 8,191
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Crown Brands LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors		Distributors	Distributors
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	10.00%		10.00%	10.00%
Interest Rate	12.95%		12.95%	12.95%
Acquisition Date	Apr. 22, 2022
Maturity Date	Dec. 09, 2025		Dec. 09, 2025	Dec. 09, 2025
Investments, amortized cost	$ 357
Investments, at fair value	$ 344
Percent of net assets	0.10%		0.10%	0.10%
Principal/Share Amount	$ 357
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember	whf:SecondLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors	Distributors	Distributors	Distributors	Distributors
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10.50%	10.50%	10.50%	10.50%	10.50%
Interest Rate	13.74%	12.00%	13.74%	13.74%	12.00%
Acquisition Date	Dec. 15, 2020	Dec. 15, 2020
Maturity Date	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026
Investments, amortized cost	$ 651	$ 650
Investments, at fair value	$ 423	$ 520
Percent of net assets	0.12%	0.15%	0.12%	0.12%	0.15%
Principal/Share Amount	$ 651	$ 650
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Interest Issuer May Pay In Cash Or Cash And PIK.	2.00%
Investment, Identifier [Axis]: Crown Brands LLC Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:CrownBrandsLLCMember	whf:CrownBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Distributors	Distributors	Distributors	Distributors	Distributors
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	10.50%	10.50%	10.50%	10.50%	10.50%
Interest Rate	13.62%	12.00%	13.62%	13.62%	12.00%
Acquisition Date	Dec. 15, 2020	Dec. 15, 2020
Maturity Date	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026	Jan. 08, 2026
Investments, amortized cost	$ 4,318	$ 4,299
Investments, at fair value	$ 2,851	$ 3,505
Percent of net assets	0.83%	1.00%	0.83%	0.83%	1.00%
Principal/Share Amount	$ 4,386	$ 4,382
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Interest Issuer May Pay In Cash Or Cash And PIK.	2.00%
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:DCAInvestmentHoldingLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		0.75%			0.75%
Spread Above Index		6.25%			6.25%
Interest Rate		7.00%			7.00%
Acquisition Date		Mar. 12, 2021
Maturity Date		Mar. 12, 2027			Mar. 12, 2027
Investments, amortized cost		$ 672
Investments, at fair value		$ 688
Percent of net assets		0.20%			0.20%
Principal/Share Amount		$ 678
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: DCA Investment Holding, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:DCAInvestmentHoldingLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		0.75%			0.75%
Spread Above Index		6.25%			6.25%
Interest Rate		7.00%			7.00%
Acquisition Date		Mar. 12, 2021
Maturity Date		Mar. 12, 2027			Mar. 12, 2027
Investments, amortized cost		$ 6,933
Investments, at fair value		$ 6,988
Percent of net assets		2.00%			2.00%
Principal/Share Amount		$ 7,025
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Drew Foam Companies Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:DrewFoamCompaniesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Nov. 05, 2020
Maturity Date		Nov. 05, 2025			Nov. 05, 2025
Investments, amortized cost		$ 7,094
Investments, at fair value		$ 7,183
Percent of net assets		2.05%			2.05%
Principal/Share Amount		$ 7,207
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Drew Foam Companies Inc, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 11/5/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:DrewFoamCompaniesIncMember	whf:DrewFoamCompaniesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Building Products	Building Products	Building Products	Building Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	9.67%	7.00%	9.67%	9.67%	7.00%
Acquisition Date	Nov. 09, 2020	Nov. 09, 2020
Maturity Date	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025	Nov. 05, 2025
Investments, amortized cost	$ 14,125	$ 7,096
Investments, at fair value	14,305	7,183
Principal/Share Amount	$ 14,305	$ 7,207
Investment, Identifier [Axis]: E-Phoenix Acquisition Co. Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 5.75%, Rate 6.75%, Due 6/23/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:E-PhoenixAcquisitionCo.Inc.Member	whf:E-PhoenixAcquisitionCo.Inc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services	Research & Consulting Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.75%	5.75%	5.75%	5.75%	5.75%
Interest Rate	9.42%	6.75%	9.42%	9.42%	6.75%
Acquisition Date	Jul. 15, 2021	Jul. 15, 2021
Maturity Date	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027	Jun. 23, 2027
Investments, amortized cost	$ 8,799	$ 8,852
Investments, at fair value	8,832	8,901
Principal/Share Amount	$ 8,888	$ 8,955
Investment, Identifier [Axis]: Eddy Acquisitions, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EddyAcquisitionsLLCMember	whf:EddyAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Spread Above Index	12.00%	12.00%	12.00%	12.00%	12.00%
Interest Rate	12.00%	12.00%	12.00%	12.00%	12.00%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 118	$ 167
Percent of net assets	0.03%	0.05%	0.03%	0.03%	0.05%
Principal/Share Amount	$ 167	$ 167
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: Education Networks of America, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EducationNetworksofAmericaIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Application Software			Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		5.50%			5.50%
Interest Rate		6.50%			6.50%
Acquisition Date		Nov. 30, 2021
Maturity Date		Oct. 27, 2026			Oct. 27, 2026
Investments, amortized cost		$ 4,511
Investments, at fair value		$ 4,508
Percent of net assets		1.29%			1.29%
Principal/Share Amount		$ 4,719
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	7.00%	7.00%	7.00%	7.00%
Interest Rate	10.05%	8.00%	10.05%	10.05%	8.00%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investments, at fair value	$ (3)
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:PrimeRateMember	London Interbank Offered Rate (LIBOR) [Member]	us-gaap:PrimeRateMember	us-gaap:PrimeRateMember	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.50%	7.00%	5.50%	5.50%	7.00%
Interest Rate	11.75%	8.00%	11.75%	11.75%	8.00%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investments, amortized cost	$ 236
Investments, at fair value	$ 234
Percent of net assets	0.07%		0.07%	0.07%
Principal/Share Amount	$ 240
PIK interest rate		0.50%			0.50%
Investment, interest rate, paid in cash		7.50%			7.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: EducationDynamics, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	7.00%	7.00%	7.00%	7.00%
Interest Rate	10.05%	8.00%	10.05%	10.05%	8.00%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026	Sep. 15, 2026
Investments, amortized cost	$ 12,912	$ 13,068
Investments, at fair value	$ 12,887	$ 13,064
Percent of net assets	3.75%	3.74%	3.75%	3.75%	3.74%
Principal/Share Amount	$ 13,119	$ 13,318
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	9.55%	7.50%	9.55%	9.55%	7.50%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: EducationDynamics, LLC Subordinated Unsecured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EducationDynamicsLLCMember	whf:EducationDynamicsLLCMember
Investment, Type [Extensible Enumeration]	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember	whf:SubordinatedUnsecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Education Services	Education Services	Education Services	Education Services	Education Services
Spread Above Index	4.00%	4.00%	4.00%	4.00%	4.00%
Interest Rate	4.00%	4.00%	4.00%	4.00%	4.00%
Acquisition Date	Sep. 15, 2021	Sep. 15, 2021
Maturity Date	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027	Mar. 15, 2027
Investments, amortized cost	$ 167	$ 167
Investments, at fair value	$ 167	$ 167
Percent of net assets	0.05%	0.05%	0.05%	0.05%	0.05%
Principal/Share Amount	$ 167	$ 167
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	6.50%	6.75%	6.50%	6.50%	6.75%
Interest Rate	9.62%	8.25%	9.62%	9.62%	8.25%
Acquisition Date	Aug. 17, 2021	Aug. 17, 2021
Maturity Date	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024
Investments, amortized cost	$ 4,792
Investments, at fair value	$ 4,820	$ 7
Percent of net assets	1.41%		1.41%	1.41%
Principal/Share Amount	$ 4,864
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Empire Office, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EmpireOfficeIncMember	whf:EmpireOfficeIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies	Office Services & Supplies
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	6.50%	6.75%	6.50%	6.50%	6.75%
Interest Rate	9.62%	8.25%	9.62%	9.62%	8.25%
Acquisition Date	Apr. 12, 2019	Apr. 12, 2019
Maturity Date	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024	Apr. 12, 2024
Investments, amortized cost	$ 11,923	$ 12,507
Investments, at fair value	$ 11,910	$ 12,589
Percent of net assets	3.47%	3.60%	3.47%	3.47%	3.60%
Principal/Share Amount	$ 12,019	$ 12,656
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		7.50%			7.50%
Interest Rate		8.50%			8.50%
Acquisition Date		Dec. 04, 2020
Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investments, amortized cost		$ 3,008
Investments, at fair value		$ 3,027
Percent of net assets		0.87%			0.87%
Principal/Share Amount		$ 3,052
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		7.50%			7.50%
Interest Rate		8.50%			8.50%
Acquisition Date		Dec. 04, 2020
Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investments, at fair value		$ 3
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Epiphany Business Services, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:EpiphanyBusinessServicesLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		7.50%			7.50%
Interest Rate		8.50%			8.50%
Acquisition Date		Dec. 04, 2020
Maturity Date		Jun. 22, 2023			Jun. 22, 2023
Investments, amortized cost		$ 4,214
Investments, at fair value		$ 4,235
Percent of net assets		1.21%			1.21%
Principal/Share Amount		$ 4,278
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Escalon Services Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	10.31%	13.50%	10.31%	10.31%	13.50%
Interest Rate	13.22%	14.50%	13.22%	13.22%	14.50%
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Maturity Date	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025	Dec. 04, 2025
Investments, amortized cost	$ 16,599	$ 7,490
Investments, at fair value	$ 17,797	$ 8,046
Percent of net assets	5.19%	2.30%	5.19%	5.19%	2.30%
Principal/Share Amount	$ 17,278	$ 8,046
PIK interest rate	1.50%		1.50%	1.50%
Investment, interest rate, paid in cash	11.72%	13.00%	11.72%	11.72%	13.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Escalon Services Inc Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:EscalonServicesIncMember	whf:EscalonServicesIncMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investments, amortized cost	$ 476	$ 476
Investments, at fair value	$ 2,368	$ 893
Percent of net assets	0.69%	0.26%	0.69%	0.69%	0.26%
Principal/Share Amount	$ 709	$ 709
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: FR Flow Control CB LLC, First Lien Secured Term Loan B, Floor 1.00%, Spread L plus 5.50%, Rate 6.50%, Due 6/28/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:FRFlowControlCBLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Industrial Machinery			Industrial Machinery
Floor		1.00%			1.00%
Spread Above Index		5.50%			5.50%
Interest Rate		6.50%			6.50%
Acquisition Date		Jul. 19, 2019
Maturity Date		Jun. 28, 2026			Jun. 28, 2026
Investments, amortized cost		$ 6,727
Investments, at fair value		6,815
Principal/Share Amount		$ 6,815
Investment, Identifier [Axis]: Flexitallic Group SAS First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:FlexitallicGroupSASMember	whf:FlexitallicGroupSASMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Commodity Chemicals	Commodity Chemicals	Commodity Chemicals	Commodity Chemicals	Commodity Chemicals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.50%	7.50%	7.50%	7.50%	7.50%
Interest Rate	11.20%	8.50%	11.20%	11.20%	8.50%
Acquisition Date	Oct. 28, 2019	Oct. 28, 2019
Maturity Date	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026	Oct. 29, 2026
Investments, amortized cost	$ 15,777	$ 15,047
Investments, at fair value	$ 16,003	$ 15,172
Percent of net assets	4.67%	4.34%	4.67%	4.67%	4.34%
Principal/Share Amount	$ 16,371	$ 15,722
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	10.70%	8.00%	10.70%	10.70%	8.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Future Payment Technologies, LP First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:FuturePaymentTechnologiesLPMember	whf:FuturePaymentTechnologiesLPMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.25%	8.25%	8.25%	8.25%	8.25%
Interest Rate	10.81%	9.25%	10.81%	10.81%	9.25%
Acquisition Date	Dec. 23, 2016	Dec. 23, 2016
Maturity Date	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024	Jun. 07, 2024
Investments, amortized cost	$ 23,074	$ 23,811
Investments, at fair value	$ 23,222	$ 23,925
Percent of net assets	6.77%	6.84%	6.77%	6.77%	6.84%
Principal/Share Amount	$ 23,222	$ 24,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Revolving Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024
Investments, at fair value	$ 2	$ 4
Investment, Identifier [Axis]: Geo Logic Systems Ltd., First Lien Secured Term Loan, Floor 1.00%, Spread C plus 6.50%, Rate 7.50%, Due 12/19/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:GeoLogicSystemsLtdMember	whf:GeoLogicSystemsLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services	Data Processing & Outsourced Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024	Dec. 19, 2024
Investments, amortized cost	$ 15,497	$ 15,766
Investments, at fair value	14,505	16,156
Principal/Share Amount	$ 20,225	$ 20,632
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Amended Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:AmendedTermLoanMember			whf:AmendedTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Floor		1.50%			1.50%
Spread Above Index		9.00%			9.00%
Interest Rate		10.50%			10.50%
Acquisition Date		Nov. 24, 2021
Maturity Date		Nov. 24, 2023			Nov. 24, 2023
Investments, amortized cost		$ 1,704
Investments, at fair value		$ 1,708
Percent of net assets		0.49%			0.49%
Principal/Share Amount		$ 1,708
PIK interest rate		10.50%			10.50%
Investment, interest rate, paid in cash		0.00%			0.00%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanAMember			whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Spread Above Index		9.00%			9.00%
Interest Rate		9.13%			9.13%
Acquisition Date		May 05, 2019
Maturity Date		Apr. 30, 2019			Apr. 30, 2019
Investments, amortized cost		$ 3,476
Investments, at fair value		$ 1,169
Percent of net assets		0.33%			0.33%
Principal/Share Amount		$ 3,476
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc First Lien Secured Term Loan B
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanBMember			whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.50%			1.50%
Spread Above Index		9.00%			9.00%
Interest Rate		10.50%			10.50%
Acquisition Date		Feb. 01, 2013
Maturity Date		Apr. 30, 2019			Apr. 30, 2019
Investments, amortized cost		$ 12,185
Investments, at fair value		$ 4,097
Percent of net assets		1.17%			1.17%
Principal/Share Amount		$ 12,185
PIK interest rate		2.00%			2.00%
Investment, interest rate, paid in cash		13.75%			13.75%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:SecondLienSecuredTermLoanMember			whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Spread Above Index		15.75%			15.75%
Interest Rate		15.75%			15.75%
Acquisition Date		Feb. 01, 2013
Maturity Date		Jul. 31, 2018			Jul. 31, 2018
Investments, amortized cost		$ 1,024
Principal/Share Amount		$ 1,028
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Grupo HIMA San Pablo, Inc Superpriority Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:GrupoHIMASanPabloIncMember
Investment, Type [Extensible Enumeration]		whf:SuperpriorityDelayedDrawLoanMember			whf:SuperpriorityDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Facilities			Health Care Facilities
Spread Above Index		12.00%			12.00%
Interest Rate		12.00%			12.00%
Acquisition Date		Nov. 24, 2021
Maturity Date		Nov. 24, 2023			Nov. 24, 2023
Investments, amortized cost		$ 568
Investments, at fair value		$ 568
Percent of net assets		0.16%			0.16%
Principal/Share Amount		$ 568
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.00%	8.00%	8.00%	8.00%	8.00%
Interest Rate	11.67%	9.00%	11.67%	11.67%	9.00%
Acquisition Date	Sep. 30, 2021	Sep. 30, 2021
Maturity Date	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026
Investments, at fair value	$ 11
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: HC Salon Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HCSalonHoldingsIncMember	whf:HCSalonHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.00%	8.00%	8.00%	8.00%	8.00%
Interest Rate	11.67%	9.00%	11.67%	11.67%	9.00%
Acquisition Date	Sep. 30, 2021	Sep. 30, 2021
Maturity Date	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026	Sep. 30, 2026
Investments, amortized cost	$ 11,365	$ 11,417
Investments, at fair value	$ 11,550	$ 11,416
Percent of net assets	3.37%	3.26%	3.37%	3.37%	3.26%
Principal/Share Amount	$ 11,550	$ 11,638
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 19, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investments, amortized cost		$ 644
Investments, at fair value		$ 651
Percent of net assets		0.19%			0.19%
Principal/Share Amount		$ 653
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 19, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HRG Management, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:HRGManagementLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 19, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investments, amortized cost		$ 4,781
Investments, at fair value		$ 4,780
Percent of net assets		1.37%			1.37%
Principal/Share Amount		$ 4,875
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	8.99%		8.99%	8.99%
Acquisition Date	Feb. 18, 2022
Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investments, amortized cost	$ 1,257
Investments, at fair value	1,242
Principal/Share Amount	$ 1,273
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	8.99%		8.99%	8.99%
Acquisition Date	Feb. 18, 2022
Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investments, at fair value	$ (4)
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Real Estate Operating Companies			Real Estate Operating Companies
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Dec. 28, 2021
Maturity Date		Oct. 19, 2026			Oct. 19, 2026
Investments, amortized cost		$ 4,781
Investments, at fair value		4,780
Principal/Share Amount		$ 4,875
Investment, Identifier [Axis]: HRG Management, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.29%, Due 10/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	HRG Management, LLC HomeRiver Group, LLC [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Real Estate Operating Companies		Real Estate Operating Companies	Real Estate Operating Companies
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	8.99%		8.99%	8.99%
Acquisition Date	Dec. 28, 2021
Maturity Date	Oct. 19, 2026		Oct. 19, 2026	Oct. 19, 2026
Investments, amortized cost	$ 9,520
Investments, at fair value	9,484
Principal/Share Amount	$ 9,677
Investment, Identifier [Axis]: Hollander Intermediate LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HollanderIntermediateLlcMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings		Home Furnishings	Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	2.00%		2.00%	2.00%
Spread Above Index	8.75%		8.75%	8.75%
Interest Rate	11.79%		11.79%	11.79%
Acquisition Date	Sep. 19, 2022
Maturity Date	Sep. 21, 2026		Sep. 21, 2026	Sep. 21, 2026
Investments, amortized cost	$ 4,849
Investments, at fair value	$ 4,671
Percent of net assets	1.36%		1.36%	1.36%
Principal/Share Amount	$ 4,891
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.46%	7.58%	7.46%	7.46%	7.58%
Interest Rate	10.80%	8.58%	10.80%	10.80%	8.58%
Acquisition Date	Sep. 06, 2019	Sep. 06, 2019
Maturity Date	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024
Investments, amortized cost	$ 4,618	$ 4,611
Investments, at fair value	$ 4,603	$ 4,578
Percent of net assets	1.34%	1.31%	1.34%	1.34%	1.31%
Principal/Share Amount	$ 4,649	$ 4,649
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	10.30%	8.08%	10.30%	10.30%	8.08%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional Interest For Senior Term Debt	3.50%
Investment, Identifier [Axis]: Honors Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:HonorsHoldingsLLCMember	whf:HonorsHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.56%	7.96%	7.56%	7.56%	7.96%
Interest Rate	10.73%	8.96%	10.73%	10.73%	8.96%
Acquisition Date	Sep. 06, 2019	Sep. 06, 2019
Maturity Date	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024	Sep. 06, 2024
Investments, amortized cost	$ 9,337	$ 9,315
Investments, at fair value	$ 9,346	$ 9,296
Percent of net assets	2.72%	2.66%	2.72%	2.72%	2.66%
Principal/Share Amount	$ 9,440	$ 9,440
PIK interest rate	0.50%	0.50%	0.50%	0.50%	0.50%
Investment, interest rate, paid in cash	10.23%	8.46%	10.23%	10.23%	8.46%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional Interest For Senior Term Debt	3.50%
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 15, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 388
Investments, at fair value		$ 388
Percent of net assets		0.11%			0.11%
Principal/Share Amount		$ 396
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 15, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: I And I Sales Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Advertising			Advertising
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 15, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 9,102
Investments, at fair value		$ 9,100
Percent of net assets		2.60%			2.60%
Principal/Share Amount		$ 9,286
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Floor	1.00%		1.00%	1.00%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	9.00%		9.00%	9.00%
Acquisition Date	Mar. 11, 2022
Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investments, amortized cost	$ 702
Investments, at fair value	707
Principal/Share Amount	$ 714
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Floor	1.00%		1.00%	1.00%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	9.42%		9.42%	9.42%
Acquisition Date	Feb. 18, 2022
Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investments, at fair value	$ 1
Investment, Identifier [Axis]: I&I Sales Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:IAndISalesGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Advertising		Advertising	Advertising
Floor	1.00%		1.00%	1.00%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	9.42%		9.42%	9.42%
Acquisition Date	Feb. 18, 2022
Maturity Date	Dec. 15, 2026		Dec. 15, 2026	Dec. 15, 2026
Investments, amortized cost	$ 9,061
Investments, at fair value	9,074
Principal/Share Amount	$ 9,216
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Sep. 21, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 1,397
Investments, at fair value		1,411
Principal/Share Amount		$ 1,411
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Jun. 25, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, at fair value		$ 5
Investment, Identifier [Axis]: IDIG Parent, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/15/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:IDIGParentLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Systems Software			Systems Software
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Jun. 25, 2021
Maturity Date		Dec. 15, 2026			Dec. 15, 2026
Investments, amortized cost		$ 8,404
Investments, at fair value		8,482
Principal/Share Amount		$ 8,482
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Air Freight & Logistics			Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 22, 2021
Maturity Date		Jun. 15, 2026			Jun. 15, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: ITS Buyer Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Air Freight & Logistics			Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 22, 2021
Maturity Date		Jun. 15, 2026			Jun. 15, 2026
Investments, amortized cost		$ 3,540
Investments, at fair value		$ 3,539
Percent of net assets		1.01%			1.01%
Principal/Share Amount		$ 3,612
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics		Air Freight & Logistics	Air Freight & Logistics
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Feb. 17, 2022
Maturity Date	Jun. 15, 2026		Jun. 15, 2026	Jun. 15, 2026
Investments, at fair value	$ 4
Investment, Identifier [Axis]: ITS Buyer Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:ITSBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics		Air Freight & Logistics	Air Freight & Logistics
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Feb. 17, 2022
Maturity Date	Jun. 15, 2026		Jun. 15, 2026	Jun. 15, 2026
Investments, amortized cost	$ 3,531
Investments, at fair value	3,553
Principal/Share Amount	$ 3,589
Investment, Identifier [Axis]: ImageOne Industries, LLC Common A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ImageOneIndustriesLLCMember	whf:ImageOneIndustriesLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember	whf:CommonAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Acquisition Date	Sep. 20, 2019	Sep. 20, 2019
Investments, amortized cost	$ 2
Investments, at fair value	$ 84	$ 158
Percent of net assets	0.02%	0.05%	0.02%	0.02%	0.05%
Principal/Share Amount	$ 227	$ 225
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.18%	7.25%	9.18%	9.18%	7.25%
Acquisition Date	Dec. 31, 2021	Dec. 31, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 871
Investments, at fair value	$ 861
Percent of net assets	0.25%		0.25%	0.25%
Principal/Share Amount	$ 886
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Industrial Specialty Services USA LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:IndustrialSpecialtyServicesUSALLCMember	whf:IndustrialSpecialtyServicesUSALLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Dec. 31, 2021	Dec. 31, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 11,715	$ 11,767
Investments, at fair value	$ 11,612	$ 11,767
Percent of net assets	3.39%	3.36%	3.39%	3.39%	3.36%
Principal/Share Amount	$ 11,917	$ 12,007
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	7.00%	7.00%	7.00%	7.00%
Interest Rate	9.91%	8.00%	9.91%	9.91%	8.00%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025
Investments, at fair value	$ (6)	$ 8
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Inspired Beauty Brands, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:InspiredBeautyBrandsIncMember	whf:InspiredBeautyBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	7.00%	7.00%	7.00%	7.00%
Interest Rate	9.91%	8.00%	9.91%	9.91%	8.00%
Acquisition Date	Dec. 30, 2020	Dec. 30, 2020
Maturity Date	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025	Dec. 30, 2025
Investments, amortized cost	$ 11,650	$ 12,055
Investments, at fair value	$ 11,509	$ 12,252
Percent of net assets	3.36%	3.50%	3.36%	3.36%	3.50%
Principal/Share Amount	$ 11,804	$ 12,252
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Dec. 04, 2020
Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investments, amortized cost		$ 2,517
Investments, at fair value		$ 2,534
Percent of net assets		0.72%			0.72%
Principal/Share Amount		$ 2,550
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Floor		3.25%			3.25%
Spread Above Index		5.75%			5.75%
Interest Rate		9.00%			9.00%
Acquisition Date		Dec. 04, 2020
Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investments, amortized cost		$ 139
Investments, at fair value		$ 147
Percent of net assets		0.04%			0.04%
Principal/Share Amount		$ 142
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: IvyRehab Intermediate II, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:IvyRehabIntermediateIILLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Dec. 04, 2020
Maturity Date		Dec. 04, 2024			Dec. 04, 2024
Investments, amortized cost		$ 17,121
Investments, at fair value		$ 17,366
Percent of net assets		4.97%			4.97%
Principal/Share Amount		$ 17,366
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: JVMC Holdings Corp First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:JVMCHoldingsCorpMember	whf:JVMCHoldingsCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.75%	6.50%	6.50%	6.75%
Interest Rate	9.62%	7.75%	9.62%	9.62%	7.75%
Acquisition Date	Feb. 28, 2019	Feb. 28, 2019
Maturity Date	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024	Feb. 28, 2024
Investments, amortized cost	$ 12,043	$ 12,674
Investments, at fair value	$ 12,077	$ 12,729
Percent of net assets	3.52%	3.64%	3.52%	3.52%	3.64%
Principal/Share Amount	$ 12,077	$ 12,729
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:JZCapitalPartnersLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Asset Management & Custody Banks		Asset Management & Custody Banks	Asset Management & Custody Banks
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	7.00%		7.00%	7.00%
Interest Rate	9.77%		9.77%	9.77%
Acquisition Date	Jan. 26, 2022
Maturity Date	Jan. 26, 2027		Jan. 26, 2027	Jan. 26, 2027
Investments, at fair value	$ 22
Percent of net assets	0.01%		0.01%	0.01%
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: JZ Capital Partners Ltd First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:JZCapitalPartnersLtdMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Asset Management & Custody Banks		Asset Management & Custody Banks	Asset Management & Custody Banks
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	7.00%		7.00%	7.00%
Interest Rate	9.77%		9.77%	9.77%
Acquisition Date	Jan. 26, 2022
Maturity Date	Jan. 26, 2027		Jan. 26, 2027	Jan. 26, 2027
Investments, amortized cost	$ 10,108
Investments, at fair value	$ 10,147
Percent of net assets	2.96%		2.96%	2.96%
Principal/Share Amount	$ 10,286
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 29, 2021
Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Delayed Draw Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Mar. 01, 2022
Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investments, at fair value	$ (3)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 29, 2021
Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investments, amortized cost		$ 586
Investments, at fair value		$ 586
Percent of net assets		0.17%			0.17%
Principal/Share Amount		$ 597
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Revolving Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Mar. 01, 2022
Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investments, at fair value	$ (1)
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Dec. 29, 2021
Maturity Date		Dec. 29, 2026			Dec. 29, 2026
Investments, amortized cost		$ 11,221
Investments, at fair value		$ 11,220
Percent of net assets		3.21%			3.21%
Principal/Share Amount		$ 11,420
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Juniper Landscaping Holdings LLC First Lien Secured Term Loan Due 12/29/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.67%		9.67%	9.67%
Acquisition Date	Mar. 01, 2022
Maturity Date	Dec. 29, 2026		Dec. 29, 2026	Dec. 29, 2026
Investments, amortized cost	$ 11,165
Investments, at fair value	11,151
Principal/Share Amount	$ 11,334
Investment, Identifier [Axis]: Keras Holdings, LLC Shares
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:KerasHoldingsLLCMember	whf:KerasHoldingsLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Acquisition Date	Dec. 31, 2020	Dec. 31, 2020
Investments, amortized cost	$ 496	$ 496
Investments, at fair value	$ 361	$ 496
Percent of net assets	0.11%	0.14%	0.11%	0.11%	0.14%
Principal/Share Amount	$ 496	$ 496
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Sep. 30, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, at fair value		$ 4
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LHS Borrower, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Sep. 30, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, amortized cost		$ 9,346
Investments, at fair value		$ 9,416
Percent of net assets		2.69%			2.69%
Principal/Share Amount		$ 9,506
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Oct. 09, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, at fair value		$ 4
Investment, Identifier [Axis]: LHS Borrower, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 9/30/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LHSBorrowerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Oct. 09, 2020
Maturity Date		Sep. 30, 2025			Sep. 30, 2025
Investments, amortized cost		$ 9,345
Investments, at fair value		9,416
Principal/Share Amount		$ 9,506
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Revolving Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Trading Companies And Distributors [Member]		Trading Companies And Distributors [Member]	Trading Companies And Distributors [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	10.33%		10.33%	10.33%
Acquisition Date	Jun. 22, 2021
Maturity Date	Feb. 24, 2026		Feb. 24, 2026	Feb. 24, 2026
Investments, at fair value	$ 10
Investment, Identifier [Axis]: LINC Systems LLC First Lien Secured Term Loan Floor 1.00 Libor Plus 6.25 Rate Due 2242026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Trading Companies And Distributors [Member]		Trading Companies And Distributors [Member]	Trading Companies And Distributors [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	10.33%		10.33%	10.33%
Acquisition Date	Jun. 22, 2021
Maturity Date	Feb. 24, 2026		Feb. 24, 2026	Feb. 24, 2026
Investments, amortized cost	$ 9,909
Investments, at fair value	10,058
Principal/Share Amount	$ 10,058
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Jun. 22, 2021
Maturity Date		Feb. 24, 2026			Feb. 24, 2026
Investments, amortized cost		$ 9,951
Investments, at fair value		10,101
Principal/Share Amount		$ 10,135
Investment, Identifier [Axis]: LINC Systems, LLC, First Lien Secured Revolving Loan, Floor 1.50%, Spread L plus 6.25%, Rate 7.25%, Due 2/24/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:LINCSystemsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Jun. 22, 2021
Maturity Date		Feb. 24, 2026			Feb. 24, 2026
Investments, at fair value		$ 12
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Electronic Equipment & Instruments			Electronic Equipment & Instruments
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Apr. 30, 2021
Maturity Date		Apr. 30, 2026			Apr. 30, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LMG Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Electronic Equipment & Instruments			Electronic Equipment & Instruments
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Apr. 30, 2021
Maturity Date		Apr. 30, 2026			Apr. 30, 2026
Investments, amortized cost		$ 6,684
Investments, at fair value		$ 6,687
Percent of net assets		1.91%			1.91%
Principal/Share Amount		$ 6,802
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	6.50%	7.00%	7.00%	6.50%
Interest Rate	10.09%	7.50%	10.09%	10.09%	7.50%
Acquisition Date	Jun. 28, 2021	Jun. 28, 2021
Maturity Date	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026
Investments, amortized cost	$ 261
Investments, at fair value	256
Principal/Share Amount	$ 265
Investment, Identifier [Axis]: LMG Holdings, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 4/30/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:LMGHoldingsIncMember	whf:LMGHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments	Electronic Equipment & Instruments
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	6.50%	7.00%	7.00%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jun. 28, 2021	Jun. 28, 2021
Maturity Date	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026	Apr. 30, 2026
Investments, amortized cost	$ 13,303	$ 6,680
Investments, at fair value	13,229	6,687
Principal/Share Amount	$ 13,501	$ 6,802
Investment, Identifier [Axis]: LSCS Holdings, Inc Second Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LSCSHoldingsIncMember	whf:LSCSHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember	whf:SecondLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Life Sciences Tools & Services	Life Sciences Tools & Services	Life Sciences Tools & Services	Life Sciences Tools & Services	Life Sciences Tools & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	0.50%	0.50%	0.50%	0.50%	0.50%
Spread Above Index	8.00%	8.00%	8.00%	8.00%	8.00%
Interest Rate	11.67%	8.50%	11.67%	11.67%	8.50%
Acquisition Date	Nov. 23, 2021	Nov. 23, 2021
Maturity Date	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029	Dec. 16, 2029
Investments, amortized cost	$ 4,932	$ 4,925
Investments, at fair value	$ 4,912	$ 4,925
Percent of net assets	1.43%	1.41%	1.43%	1.43%	1.41%
Principal/Share Amount	$ 5,000	$ 5,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	10.20%	8.25%	10.20%	10.20%	8.25%
Acquisition Date	Oct. 16, 2019	Oct. 16, 2019
Maturity Date	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023
Investments, amortized cost	$ 5,135	$ 5,166
Investments, at fair value	$ 5,144	$ 5,183
Percent of net assets	1.50%	1.48%	1.50%	1.50%	1.48%
Principal/Share Amount	$ 5,144	$ 5,183
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lab Logistics, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LabLogisticsLLCMember	whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	10.16%	8.25%	10.16%	10.16%	8.25%
Acquisition Date	Oct. 16, 2019	Oct. 16, 2019
Maturity Date	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023	Sep. 25, 2023
Investments, amortized cost	$ 5,446	$ 1,140
Investments, at fair value	$ 5,495	$ 1,155
Percent of net assets	1.60%	0.33%	1.60%	1.60%	0.33%
Principal/Share Amount	$ 5,501	$ 1,155
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lab Logistics, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:LabLogisticsLLCMember
Investment, Type [Extensible Enumeration]		whf:PreferredUnitsMember			whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Health Care Services			Health Care Services
Spread Above Index		14.00%			14.00%
Acquisition Date		Oct. 29, 2019
Investments, amortized cost		$ 857
Investments, at fair value		$ 1,018
Percent of net assets		0.29%			0.29%
Principal/Share Amount		$ 2
PIK interest rate		14.00%			14.00%
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Non-income Producing [true false]		true			true
Investment, Identifier [Axis]: Lenny & Larry's, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.92%	8.40%	8.92%	8.92%	8.40%
Interest Rate	11.74%	9.40%	11.74%	11.74%	9.40%
Acquisition Date	May 15, 2018	May 15, 2018
Maturity Date	May 15, 2023	May 15, 2023	May 15, 2023	May 15, 2023	May 15, 2023
Investments, amortized cost	$ 11,175	$ 11,084
Investments, at fair value	$ 10,922	$ 10,862
Percent of net assets	3.19%	3.11%	3.19%	3.19%	3.11%
Principal/Share Amount	$ 11,201	$ 11,142
PIK interest rate	1.71%	1.72%	1.71%	1.71%	1.72%
Investment, interest rate, paid in cash	10.03%	7.68%	10.03%	10.03%	7.68%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Additional interest for senior term debt	3.00%
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan A
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember	whf:FirstLienSecuredTermLoanAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.50%	7.50%	7.50%	7.50%	7.50%
Interest Rate	10.62%	8.50%	10.62%	10.62%	8.50%
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Maturity Date	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025
Investments, amortized cost	$ 5,541	$ 5,570
Investments, at fair value	$ 5,533	$ 5,546
Percent of net assets	1.61%	1.59%	1.61%	1.61%	1.59%
Principal/Share Amount	$ 5,588	$ 5,631
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Lift Brands, Inc First Lien Secured Term Loan B
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LiftBrandsIncMember	whf:LiftBrandsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember	whf:FirstLienSecuredTermLoanBMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Spread Above Index	9.50%	9.50%	9.50%	9.50%	9.50%
Interest Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Maturity Date	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025	Jun. 29, 2025
Investments, amortized cost	$ 1,314	$ 1,259
Investments, at fair value	$ 1,302	$ 1,239
Percent of net assets	0.38%	0.35%	0.38%	0.38%	0.35%
Principal/Share Amount	$ 1,330	$ 1,279
PIK interest rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, interest rate, paid in cash	0.00%	0.00%	0.00%	0.00%	0.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Luxury Brand Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LuxuryBrandHoldingsIncMember	whf:LuxuryBrandHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.31%	7.50%	9.31%	9.31%	7.50%
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Maturity Date	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026	Jun. 04, 2026
Investments, amortized cost	$ 5,816	$ 5,844
Investments, at fair value	$ 5,854	$ 5,940
Percent of net assets	1.71%	1.70%	1.71%	1.71%	1.70%
Principal/Share Amount	$ 5,895	$ 5,940
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	8.88%	7.00%	8.88%	8.88%	7.00%
Acquisition Date	Jan. 21, 2021	Jan. 21, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, at fair value	$ 24	$ 28
Investment, Identifier [Axis]: MEP-TS Midco, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MEP-TSMidcoLLCMember	whf:MEP-TSMidcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	8.88%	7.00%	8.88%	8.88%	7.00%
Acquisition Date	Jan. 21, 2021	Jan. 21, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 13,183	$ 13,247
Investments, at fair value	13,387	13,490
Principal/Share Amount	$ 13,387	$ 13,490
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MSIInformationServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media & Services		Interactive Media & Services	Interactive Media & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember		us-gaap:BaseRateMember	us-gaap:BaseRateMember
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	13.00%		13.00%	13.00%
Acquisition Date	Apr. 25, 2022
Maturity Date	Apr. 24, 2026		Apr. 24, 2026	Apr. 24, 2026
Investments, amortized cost	$ 295
Investments, at fair value	$ 286
Percent of net assets	0.08%		0.08%	0.08%
Principal/Share Amount	$ 300
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: MSI Information Services, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MSIInformationServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media & Services		Interactive Media & Services	Interactive Media & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	7.75%		7.75%	7.75%
Interest Rate	10.88%		10.88%	10.88%
Acquisition Date	Apr. 25, 2022
Maturity Date	Apr. 24, 2026		Apr. 24, 2026	Apr. 24, 2026
Investments, amortized cost	$ 7,711
Investments, at fair value	$ 7,647
Percent of net assets	2.23%		2.23%	2.23%
Principal/Share Amount	$ 7,851
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Manchester Acquisition Sub LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ManchesterAcquisitionSubLLCMember	whf:ManchesterAcquisitionSubLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	whf:SecuredOvernightFinancingRateMember
Floor	0.75%	0.75%	0.75%	0.75%	0.75%
Spread Above Index	5.75%	5.75%	5.75%	5.75%	5.75%
Interest Rate	8.85%	6.50%	8.85%	8.85%	6.50%
Acquisition Date	Nov. 16, 2021	Nov. 16, 2021
Maturity Date	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026	Nov. 16, 2026
Investments, amortized cost	$ 7,575	$ 11,348
Investments, at fair value	$ 7,246	$ 11,340
Percent of net assets	2.11%	3.24%	2.11%	2.11%	3.24%
Principal/Share Amount	$ 7,940	$ 12,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Internet & Direct Marketing Retail			Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Aug. 06, 2021
Maturity Date		Jul. 01, 2025			Jul. 01, 2025
Investments, amortized cost		$ 4,200
Investments, at fair value		$ 4,206
Percent of net assets		1.20%			1.20%
Principal/Share Amount		$ 4,277
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.57%	7.50%	9.57%	9.57%	7.50%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025
Investments, at fair value	$ 9	$ 11
Investment, Identifier [Axis]: Marlin DTC-LS Midco 2, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/1/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MarlinDTC-LSMidco2LLCMember	whf:MarlinDTC-LSMidco2LLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.57%	7.50%	9.57%	9.57%	7.50%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025	Jul. 01, 2025
Investments, amortized cost	$ 18,901	$ 15,153
Investments, at fair value	19,105	15,342
Principal/Share Amount	$ 19,105	$ 15,342
Investment, Identifier [Axis]: Max Solutions Inc. Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Max Solutions Inc
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Acquisition Date	Sep. 29, 2022
Investments, amortized cost	$ 400
Investments, at fair value	$ 400
Percent of net assets	0.12%		0.12%	0.12%
Principal/Share Amount	$ 4
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	false		false	false
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Revolving Loan CAD
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Max Solutions Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:LennyLarrysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Industry Sector [Extensible Enumeration]	Paper Packaging		Paper Packaging	Paper Packaging
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.21%		10.21%	10.21%
Acquisition Date	Sep. 29, 2022
Maturity Date	Sep. 29, 2028		Sep. 29, 2028	Sep. 29, 2028
Investments, amortized cost	$ 8,099
Investments, at fair value	$ 8,099
Percent of net assets	2.35%		2.35%	2.35%
Principal/Share Amount	$ 8,264
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MaxitransfersBlockerCorpMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Consumer Finance			Consumer Finance
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		8.50%			8.50%
Interest Rate		9.50%			9.50%
Acquisition Date		Oct. 07, 2020
Maturity Date		Oct. 07, 2025			Oct. 07, 2025
Investments, amortized cost		$ 1,019
Investments, at fair value		$ 1,038
Percent of net assets		0.30%			0.30%
Principal/Share Amount		$ 1,038
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Maxitransfers Blocker Corp First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MaxitransfersBlockerCorpMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Consumer Finance			Consumer Finance
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		8.50%			8.50%
Interest Rate		9.50%			9.50%
Acquisition Date		Oct. 07, 2020
Maturity Date		Oct. 07, 2025			Oct. 07, 2025
Investments, amortized cost		$ 8,436
Investments, at fair value		$ 8,590
Percent of net assets		2.46%			2.46%
Principal/Share Amount		$ 8,590
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	9.52%	7.00%	9.52%	9.52%	7.00%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost	$ 881
Investments, at fair value	885
Principal/Share Amount	$ 897
Investment, Identifier [Axis]: Meta Buyer LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.97%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	8.80%	7.00%	8.80%	8.80%	7.00%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost		$ 246
Investments, at fair value	$ 6	246
Principal/Share Amount		$ 251
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.00%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	7.00%	7.00%	7.00%	7.00%	7.00%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost	$ 13,664	$ 13,737
Investments, at fair value	11,844	13,843
Principal/Share Amount	$ 12,318	$ 12,411
Investment, Identifier [Axis]: Meta Buyer LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.33%, Due 11/1/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:MetaBuyerLLCMember	whf:MetaBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Pharmaceuticals [Member]	Personal Products	Pharmaceuticals [Member]	Pharmaceuticals [Member]	Personal Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	8.80%	7.00%	8.80%	8.80%	7.00%
Acquisition Date	Dec. 16, 2021	Dec. 16, 2021
Maturity Date	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027	Nov. 01, 2027
Investments, amortized cost	$ 967	$ 972
Investments, at fair value	971	972
Principal/Share Amount	$ 984	$ 991
Investment, Identifier [Axis]: Mikawaya Holdings, LLC, First Lien Secured Term Loan, Floor 1.25%, Spread L plus 5.50%, Rate 6.75%, Due 1/29/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:MikawayaHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Packaged Foods & Meats			Packaged Foods & Meats
Floor		1.25%			1.25%
Spread Above Index		5.50%			5.50%
Interest Rate		6.75%			6.75%
Acquisition Date		Feb. 18, 2020
Maturity Date		Jan. 29, 2025			Jan. 29, 2025
Investments, amortized cost		$ 2,988
Investments, at fair value		3,026
Principal/Share Amount		$ 3,026
Investment, Identifier [Axis]: Mills Fleet Farm Group, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:MillsFleetFarmGroupLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Department Stores			Department Stores
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Oct. 24, 2018
Maturity Date		Oct. 24, 2024			Oct. 24, 2024
Investments, amortized cost		$ 13,331
Investments, at fair value		$ 13,538
Percent of net assets		3.87%			3.87%
Principal/Share Amount		$ 13,538
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Motivational CIV, LLC Class B Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalCIVLLCMember	whf:MotivationalCIVLLCMember
Investment, Type [Extensible Enumeration]	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember	whf:ClassBUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Investments, amortized cost	$ 1,250	$ 1,250
Investments, at fair value	$ 606	$ 1,250
Percent of net assets	0.18%	0.36%	0.18%	0.18%	0.36%
Principal/Share Amount	$ 1,250	$ 1,250
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.07%	7.25%	9.07%	9.07%	7.25%
Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Maturity Date	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026
Investments, at fair value	$ (22)	$ 7
Percent of net assets	(0.01%)		(0.01%)	(0.01%)
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Motivational Marketing, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:MotivationalMarketingLLCMember	whf:MotivationalMarketingLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics	Air Freight & Logistics
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.07%	7.25%	9.07%	9.07%	7.25%
Acquisition Date	Jul. 12, 2021	Jul. 12, 2021
Maturity Date	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026	Jul. 12, 2026
Investments, amortized cost	$ 10,956	$ 11,575
Investments, at fair value	$ 10,744	$ 11,646
Percent of net assets	3.13%	3.33%	3.13%	3.13%	3.33%
Principal/Share Amount	$ 11,124	$ 11,789
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: NMFC Senior Loan Program I LLC Units
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:ArcoleHoldingCorporationMember
Investment, Type [Extensible Enumeration]		Equity Investments			Equity Investments
Investments, at fair value						9,269
Investment, Identifier [Axis]: NNA Services, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:NNAServicesLLCMember	whf:NNAServicesLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.75%	6.75%	6.75%	6.75%	6.75%
Interest Rate	10.42%	7.75%	10.42%	10.42%	7.75%
Acquisition Date	Aug. 27, 2021	Aug. 27, 2021
Maturity Date	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026	Aug. 27, 2026
Investments, amortized cost	$ 11,264	$ 11,459
Investments, at fair value	$ 11,165	$ 11,460
Percent of net assets	3.25%	3.28%	3.25%	3.25%	3.28%
Principal/Share Amount	$ 11,375	$ 11,594
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NPAVLessorCorp.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	us-gaap:RealEstateSectorMember		us-gaap:RealEstateSectorMember	us-gaap:RealEstateSectorMember
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.16%		9.16%	9.16%
Acquisition Date	Mar. 01, 2022
Maturity Date	Jan. 21, 2027		Jan. 21, 2027	Jan. 21, 2027
Investments, at fair value	$ (16)
Investment, Identifier [Axis]: NPAV Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.60%, Due 1/21/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:NPAVLessorCorp.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	us-gaap:RealEstateSectorMember		us-gaap:RealEstateSectorMember	us-gaap:RealEstateSectorMember
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.16%		9.16%	9.16%
Acquisition Date	Mar. 01, 2022
Maturity Date	Jan. 21, 2027		Jan. 21, 2027	Jan. 21, 2027
Investments, amortized cost	$ 8,791
Investments, at fair value	8,588
Principal/Share Amount	$ 8,946
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:NavigaIncMember	whf:NavigaIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	London Interbank Offered Rate (LIBOR) [Member]	us-gaap:BaseRateMember	us-gaap:BaseRateMember	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.92%	7.00%	6.92%	6.92%	7.00%
Interest Rate	10.28%	8.00%	10.28%	10.28%	8.00%
Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Maturity Date	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022
Investments, amortized cost	$ 267	$ 168
Investments, at fair value	$ 261	$ 169
Percent of net assets	0.08%	0.05%	0.08%	0.08%	0.05%
Principal/Share Amount	$ 267	$ 169
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Naviga Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:NavigaIncMember	whf:NavigaIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Application Software	Application Software	Application Software	Application Software	Application Software
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	7.00%	7.00%	7.00%	7.00%
Interest Rate	10.67%	8.00%	10.67%	10.67%	8.00%
Acquisition Date	Jun. 14, 2019	Jun. 14, 2019
Maturity Date	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022	Dec. 29, 2022
Investments, amortized cost	$ 3,184	$ 3,195
Investments, at fair value	$ 3,125	$ 3,213
Percent of net assets	0.91%	0.92%	0.91%	0.91%	0.92%
Principal/Share Amount	$ 3,189	$ 3,213
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Nelson Worldwide, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:NelsonWorldwideLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Research & Consulting Services			Research & Consulting Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		10.25%			10.25%
Interest Rate		11.25%			11.25%
Acquisition Date		Jan. 09, 2018
Maturity Date		Jan. 09, 2023			Jan. 09, 2023
Investments, amortized cost		$ 9,976
Investments, at fair value		$ 9,826
Percent of net assets		2.81%			2.81%
Principal/Share Amount		$ 10,027
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc Class A Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember	whf:ClassAUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Data Processing & Outsourced Services	Building Products	Building Products	Data Processing & Outsourced Services
Acquisition Date	Dec. 17, 2021	Dec. 17, 2021
Investments, amortized cost	$ 423	$ 423
Investments, at fair value	$ 603				$ 427
Percent of net assets	0.18%	0.12%	0.18%	0.18%	0.12%
Principal/Share Amount		$ 1	$ 1
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 2.45
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		whf:CanadaPrimeRateMember			whf:CanadaPrimeRateMember
Floor		2.45%			2.45%
Spread Above Index		5.50%			5.50%
Interest Rate		7.95%			7.95%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Revolving Loan Floor 3.25
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Floor		3.25%			3.25%
Spread Above Index		5.50%			5.50%
Interest Rate		8.75%			8.75%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	8.71%		8.71%	8.71%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, amortized cost	$ 6,889
Investments, at fair value	$ 6,382
Percent of net assets	1.85%		1.85%	1.85%
Principal/Share Amount			$ 8,959
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 2.45
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		whf:CanadaPrimeRateMember			whf:CanadaPrimeRateMember
Floor		2.45%			2.45%
Spread Above Index		5.50%			5.50%
Interest Rate		7.95%			7.95%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investments, amortized cost		$ 6,923
Investments, at fair value		$ 6,998
Percent of net assets		2.00%			2.00%
Principal/Share Amount		$ 9,027
Investment, Restriction Status [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc First Lien Secured Term Loan Floor 3.25
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		us-gaap:PrimeRateMember			us-gaap:PrimeRateMember
Floor		3.25%			3.25%
Spread Above Index		5.50%			5.50%
Interest Rate		8.75%			8.75%
Acquisition Date		Dec. 17, 2021
Maturity Date		Dec. 17, 2026			Dec. 17, 2026
Investments, amortized cost		$ 2,154
Investments, at fair value		$ 2,154
Percent of net assets		0.62%			0.62%
Principal/Share Amount		$ 2,198
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	8.71%		8.71%	8.71%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, at fair value	$ 2
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Revolving Loan LIBOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	8.28%		8.28%	8.28%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, at fair value	$ 1
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PFB Holdco, Inc. First Lien Secured Term Loan LIBOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PFBHoldcoIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products		Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	8.28%		8.28%	8.28%
Acquisition Date	Dec. 17, 2021
Maturity Date	Dec. 17, 2026		Dec. 17, 2026	Dec. 17, 2026
Investments, amortized cost	$ 2,144
Investments, at fair value	$ 2,154
Percent of net assets	0.63%		0.63%	0.63%
Principal/Share Amount	$ 2,182
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	9.75%	9.25%	9.75%	9.75%	9.25%
Interest Rate	12.57%	10.25%	12.57%	12.57%	10.25%
Acquisition Date	Nov. 25, 2020	Nov. 25, 2020
Maturity Date	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025
Investments, amortized cost	$ 347	$ 689
Investments, at fair value	$ 308	$ 631
Percent of net assets	0.09%	0.18%	0.09%	0.09%	0.18%
Principal/Share Amount	$ 352	$ 702
PIK interest rate	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, interest rate, paid in cash	11.07%	8.75%	11.07%	11.07%	8.75%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PG Dental New Jersey Parent, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PGDentalNewJerseyParentLLCMember	whf:PGDentalNewJerseyParentLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Health Care Services	Health Care Services	Health Care Services	Health Care Services	Health Care Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	9.75%	9.25%	9.75%	9.75%	9.25%
Interest Rate	12.57%	10.25%	12.57%	12.57%	10.25%
Acquisition Date	Nov. 25, 2020	Nov. 25, 2020
Maturity Date	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025	Nov. 25, 2025
Investments, amortized cost	$ 14,640	$ 15,178
Investments, at fair value	$ 13,807	$ 14,212
Percent of net assets	4.03%	4.06%	4.03%	4.03%	4.06%
Principal/Share Amount	$ 14,845	$ 15,448
PIK interest rate	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, interest rate, paid in cash	11.07%	8.75%	11.07%	11.07%	8.75%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment		Heavy Electrical Equipment	Heavy Electrical Equipment
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	9.92%		9.92%	9.92%
Acquisition Date	Jul. 11, 2022
Maturity Date	Jun. 25, 2026		Jun. 25, 2026	Jun. 25, 2026
Investments, at fair value	$ (1)
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Jun. 25, 2021	Jun. 25, 2021
Maturity Date	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024	Jun. 25, 2024
Investments, amortized cost	$ 103	$ 103
Investments, at fair value	$ 63	$ 113
Percent of net assets	0.02%	0.03%	0.02%	0.02%	0.03%
Principal/Share Amount	$ 104	$ 104
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PPS CR Acquisition, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PPSCRAcquisitionIncMember	whf:PPSCRAcquisitionIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment	Heavy Electrical Equipment
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Jun. 25, 2021	Jun. 25, 2021
Maturity Date	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026	Jun. 25, 2026
Investments, amortized cost	$ 13,942	$ 10,924
Investments, at fair value	$ 13,835	$ 10,975
Percent of net assets	4.03%	3.14%	4.03%	4.03%	3.14%
Principal/Share Amount	$ 14,166	$ 11,123
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Delayed Draw Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PSLightwaveInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.50%			1.50%
Spread Above Index		6.75%			6.75%
Interest Rate		8.25%			8.25%
Acquisition Date		May 19, 2020
Maturity Date		Mar. 10, 2025			Mar. 10, 2025
Investments, at fair value		$ 5
Investment, Identifier [Axis]: PS Lightwave, Inc., First Lien Secured Term Loan, Floor 1.50%, Spread L plus 6.75%, Rate 8.25%, Due 3/10/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:PSLightwaveInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.50%			1.50%
Spread Above Index		6.75%			6.75%
Interest Rate		8.25%			8.25%
Acquisition Date		May 19, 2020
Maturity Date		Mar. 10, 2025			Mar. 10, 2025
Investments, amortized cost		$ 7,207
Investments, at fair value		7,230
Principal/Share Amount		$ 7,304
Investment, Identifier [Axis]: Patagonia Hold co Llc First Lien Secured Term Loans
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PatagoniaHoldcoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Alternative Carriers		Alternative Carriers	Alternative Carriers
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	5.75%		5.75%	5.75%
Interest Rate	8.39%		8.39%	8.39%
Acquisition Date	Aug. 05, 2022
Maturity Date	Aug. 01, 2029		Aug. 01, 2029	Aug. 01, 2029
Investments, amortized cost	$ 12,040
Investments, at fair value	$ 11,993
Percent of net assets	3.50%		3.50%	3.50%
Principal/Share Amount	$ 14,625
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Pennsylvania Machine Works, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.25%, Rate 8.57%, Due 3/8/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PennsylvaniaMachineWorksLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	10.06%		10.06%	10.06%
Acquisition Date	Mar. 25, 2022
Maturity Date	Mar. 08, 2027		Mar. 08, 2027	Mar. 08, 2027
Investments, amortized cost	$ 6,833
Investments, at fair value	6,925
Principal/Share Amount	$ 6,925
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		PlayMonster LLC [Member].
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Leisure Products			Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Jun. 07, 2021
Maturity Date		Jun. 07, 2026			Jun. 07, 2026
Investments, amortized cost		$ 221
Investments, at fair value		$ (828)
Percent of net assets		(0.24%)			(0.24%)
Principal/Share Amount		$ 224
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: PlayMonster LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	PlayMonster LLC [Member].	PlayMonster LLC [Member].
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Leisure Products			Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.00%			6.00%
Interest Rate		7.00%			7.00%
Acquisition Date		Jun. 07, 2021
Maturity Date		Jun. 07, 2026			Jun. 07, 2026
Investments, amortized cost		$ 5,894
Investments, at fair value		$ 3,900
Percent of net assets		1.12%			1.12%
Principal/Share Amount		$ 6,000
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Playmonster Group Equity Inc Common Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Identifier [Axis]: Playmonster Group Equity Inc Preferred Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	us-gaap:PreferredStockMember		us-gaap:PreferredStockMember	us-gaap:PreferredStockMember
Investments, at fair value	$ 2,099
Investment, Identifier [Axis]: Playmonster Group Equity, Inc Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupEquityIncMember
Investment, Type [Extensible Enumeration]	Common Stock [Member]		Common Stock [Member]	Common Stock [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Acquisition Date	Jan. 24, 2022
Investments, amortized cost	$ 460
Principal/Share Amount	$ 72
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	false		false	false
Investment, Identifier [Axis]: Playmonster Group Equity, Inc. Preferred Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupEquityIncMember
Investment, Type [Extensible Enumeration]	us-gaap:PreferredStockMember		us-gaap:PreferredStockMember	us-gaap:PreferredStockMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Spread Above Index	14.00%		14.00%	14.00%
Acquisition Date	Jan. 24, 2022
Investments, amortized cost	$ 3,600
Investments, at fair value	$ 2,099
Percent of net assets	0.62%		0.62%	0.62%
Principal/Share Amount	$ 36
PIK interest rate	14.00%		14.00%	14.00%
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Non-income Producing [true false]	true		true	true
Investment, Identifier [Axis]: Playmonster Group LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	us-gaap-supplement:InvestmentAffiliatedIssuerMember		us-gaap-supplement:InvestmentAffiliatedIssuerMember	us-gaap-supplement:InvestmentAffiliatedIssuerMember
Investment, Issuer Name [Extensible Enumeration]	whf:PlaymonsterGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products		Leisure Products	Leisure Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	8.00%		8.00%	8.00%
Interest Rate	10.78%		10.78%	10.78%
Acquisition Date	Jan. 24, 2022
Maturity Date	Jun. 08, 2026		Jun. 08, 2026	Jun. 08, 2026
Investments, amortized cost	$ 3,565
Investments, at fair value	$ 3,509
Percent of net assets	1.02%		1.02%	1.02%
Principal/Share Amount	$ 3,565
PIK interest rate	8.00%		8.00%	8.00%
Investment, interest rate, paid in cash	2.78%		2.78%	2.78%
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Interest issuer may Pay In Cash Or Cash And PIK	9.00%
Investment, Identifier [Axis]: Potpourri Group, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:PotpourriGroupIncMember	whf:PotpourriGroupIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.50%	1.50%	1.50%	1.50%	1.50%
Spread Above Index	8.25%	8.25%	8.25%	8.25%	8.25%
Interest Rate	9.75%	9.75%	9.75%	9.75%	9.75%
Acquisition Date	Jul. 03, 2019	Jul. 03, 2019
Maturity Date	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024	Jul. 03, 2024
Investments, amortized cost	$ 16,383	$ 16,955
Investments, at fair value	$ 16,513	$ 17,148
Percent of net assets	4.81%	4.90%	4.81%	4.81%	4.90%
Principal/Share Amount	$ 16,513	$ 17,148
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Poultry Holdings LLC (HPP), First Lien Secured Term Loan, Floor 1.00%, Spread L plus 7.25%, Rate 8.25% (6.75% Cash + 1.50% PIK), Due 6/28/225
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:PoultryHoldingsLLCMember	whf:PoultryHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.25%	7.25%	7.25%	7.25%	7.25%
Interest Rate	10.38%	8.25%	10.38%	10.38%	8.25%
Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Maturity Date	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025	Jun. 28, 2025
Investments, amortized cost	$ 7,117	$ 7,676
Investments, at fair value	6,914	6,993
Principal/Share Amount	$ 7,183	$ 7,770
PIK interest rate	1.50%	1.50%	1.50%	1.50%	1.50%
Investment, interest rate, paid in cash	8.88%	6.75%	8.88%	8.88%	6.75%
Investment, Identifier [Axis]: Project Castle, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:ProjectCastleIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Industrial Machinery		Industrial Machinery	Industrial Machinery
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	5.50%		5.50%	5.50%
Interest Rate	9.05%		9.05%	9.05%
Acquisition Date	Jun. 09, 2022
Maturity Date	Jun. 01, 2029		Jun. 01, 2029	Jun. 01, 2029
Investments, amortized cost	$ 7,521
Investments, at fair value	$ 7,541
Percent of net assets	2.20%		2.20%	2.20%
Principal/Share Amount	$ 8,376
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Quest Events, LLC Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Acquisition Date	Dec. 28, 2018	Dec. 28, 2018
Maturity Date	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025	Dec. 08, 2025
Investments, amortized cost	$ 331	$ 317
Investments, at fair value	$ 60
Percent of net assets	0.02%		0.02%	0.02%
Principal/Share Amount	$ 331	$ 317
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	9.67%	7.00%	9.67%	9.67%	7.00%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024
Investments, amortized cost	$ 464	$ 925
Investments, at fair value	424	760
Principal/Share Amount	$ 468	$ 935
Investment, Identifier [Axis]: Quest Events, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/28/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:QuestEventsLLCMember	whf:QuestEventsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services	Diversified Support Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	9.67%	7.00%	9.67%	9.67%	7.00%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Maturity Date	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024	Dec. 28, 2024
Investments, amortized cost	$ 11,838	$ 11,848
Investments, at fair value	11,317	9,729
Principal/Share Amount	$ 11,926	$ 11,966
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.04%	7.25%	9.04%	9.04%	7.25%
Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 2,967
Investments, at fair value	2,969	$ (5)
Principal/Share Amount	$ 3,014
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/31/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.20%	7.25%	9.20%	9.20%	7.25%
Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 526	$ 804
Investments, at fair value	525	814
Principal/Share Amount	$ 533	$ 818
Investment, Identifier [Axis]: RCKC Acquisitions LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.25%, Rate 7.25%, Due 12/312026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RCKCAcquisitionsLLCMember	whf:RCKCAcquisitionsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.25%	6.25%	6.25%	6.25%	6.25%
Interest Rate	9.92%	7.25%	9.92%	9.92%	7.25%
Acquisition Date	Jan. 27, 2021	Jan. 27, 2021
Maturity Date	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026	Dec. 31, 2026
Investments, amortized cost	$ 11,018	$ 11,074
Investments, at fair value	11,011	11,151
Principal/Share Amount	$ 11,179	$ 11,264
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:RLJPro-VacInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Dec. 31, 2021
Maturity Date		Dec. 31, 2026			Dec. 31, 2026
Investments, amortized cost		$ 8,600
Investments, at fair value		$ 8,600
Percent of net assets		2.46%			2.46%
Principal/Share Amount		$ 8,775
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: RLJ Pro-Vac, Inc. First Lien Secured Term Loan First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:RLJPro-VacInc.Member
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Environmental & Facilities Services			Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.25%			6.25%
Interest Rate		7.25%			7.25%
Acquisition Date		Dec. 31, 2021
Maturity Date		Dec. 31, 2026			Dec. 31, 2026
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Road Safety Services, First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Dec. 30, 2021
Maturity Date		Mar. 18, 2025			Mar. 18, 2025
Investments, amortized cost		$ 4,017
Investments, at fair value		$ 4,017
Percent of net assets		1.15%			1.15%
Principal/Share Amount		$ 4,099
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.50%, Rate 8.75%, Due 9/18/2023
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Floor		3.25%			3.25%
Spread Above Index		5.50%			5.50%
Interest Rate		8.75%			8.75%
Acquisition Date		Dec. 31, 2019
Maturity Date		Sep. 18, 2023			Sep. 18, 2023
Investments, amortized cost		$ 489
Investments, at fair value		501
Principal/Share Amount		$ 496
Investment, Identifier [Axis]: Road Safety Services, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 3/18/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:RoadSafetyServicesIncMember	whf:RoadSafetyServicesIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Construction & Engineering	Construction & Engineering	Construction & Engineering	Construction & Engineering	Construction & Engineering
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Acquisition Date	Dec. 31, 2019	Dec. 31, 2019
Maturity Date	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025	Mar. 18, 2025
Investments, amortized cost	$ 8,534	$ 6,340
Investments, at fair value	8,625	6,405
Principal/Share Amount	$ 8,625	$ 6,427
Investment, Identifier [Axis]: Ross-Simons Topco, LP Preferred Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:Ross-SimonsTopcoLPMember	whf:Ross-SimonsTopcoLPMember
Investment, Type [Extensible Enumeration]	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember	whf:PreferredUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail	Internet & Direct Marketing Retail
Spread Above Index	8.00%	8.00%	8.00%	8.00%	8.00%
Acquisition Date	Dec. 04, 2020	Dec. 04, 2020
Investments, amortized cost	$ 514	$ 600
Investments, at fair value	$ 816	$ 786
Percent of net assets	0.24%	0.22%	0.24%	0.24%	0.22%
Principal/Share Amount	$ 600	$ 600
PIK interest rate	8.00%	8.00%	8.00%	8.00%	8.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	true	false	false	true
Investment, Identifier [Axis]: SFS Global Holding Company Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SFSGlobalHoldingCompanyMember	whf:SFSGlobalHoldingCompanyMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services
Acquisition Date	Jun. 28, 2018	Jun. 28, 2018
Maturity Date	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Sigue Corporation Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SigueCorporationMember	whf:SigueCorporationMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services	Other Diversified Financial Services
Acquisition Date	Jun. 28, 2018	Jun. 28, 2018
Maturity Date	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025	Dec. 28, 2025
Investments, amortized cost	$ 2,890	$ 2,890
Investments, at fair value	$ 3,823	$ 3,492
Percent of net assets	1.11%	1.00%	1.11%	1.11%	1.00%
Principal/Share Amount	$ 22	$ 22
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Sklar Holdings, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SklarHoldingsIncMember	whf:SklarHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals	Diversified Chemicals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	9.75%	7.75%	9.75%	9.75%	7.75%
Interest Rate	10.75%	8.75%	10.75%	10.75%	8.75%
Acquisition Date	Nov. 13, 2019	Nov. 13, 2019
Maturity Date	May 13, 2023	May 13, 2023	May 13, 2023	May 13, 2023	May 13, 2023
Investments, amortized cost	$ 7,292	$ 7,295
Investments, at fair value	$ 6,695	$ 7,020
Percent of net assets	1.95%	2.01%	1.95%	1.95%	2.01%
Principal/Share Amount	$ 7,353	$ 7,389
PIK interest rate	2.00%		2.00%	2.00%
Investment, interest rate, paid in cash	8.75%		8.75%	8.75%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	8.92%	7.50%	8.92%	8.92%	7.50%
Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investments, at fair value	$ 10
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Sleep OpCo LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SleepOpCoLLCMember	whf:SleepOpCoLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings	Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	8.92%	7.50%	8.92%	8.92%	7.50%
Acquisition Date	Oct. 12, 2021	Oct. 12, 2021
Maturity Date	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026	Oct. 12, 2026
Investments, amortized cost	$ 20,555	$ 19,651
Investments, at fair value	$ 20,630	$ 19,645
Percent of net assets	6.01%	5.62%	6.01%	6.01%	5.62%
Principal/Share Amount	$ 20,895	$ 20,034
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread E plus 6.00%, Rate 7.25%, Due 4/29/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	7.25%		7.25%	7.25%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 29, 2027		Apr. 29, 2027	Apr. 29, 2027
Investments, amortized cost	$ 437
Investments, at fair value	396
Principal/Share Amount	$ 419
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.25%, Due 4/29/27
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember		whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	8.68%		8.68%	8.68%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 29, 2027		Apr. 29, 2027	Apr. 29, 2027
Investments, amortized cost	$ 17
Investments, at fair value	17
Principal/Share Amount	$ 17
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread E plus 6.25%, Rate 7.25%, Due 4/28/28
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.25%		6.25%	6.25%
Interest Rate	7.25%		7.25%	7.25%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 28, 2028		Apr. 28, 2028	Apr. 28, 2028
Investments, amortized cost	$ 6,876
Investments, at fair value	6,364
Principal/Share Amount	$ 6,659
Investment, Identifier [Axis]: Smalto Inc., First Lien Secured Term Loan, Floor 1.00%, Spread SF plus 6.00%, Rate 7.18%, Due 4/28/28
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SmaltoInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.19%		9.19%	9.19%
Acquisition Date	May 04, 2022
Maturity Date	Apr. 28, 2028		Apr. 28, 2028	Apr. 28, 2028
Investments, amortized cost	$ 995
Investments, at fair value	996
Principal/Share Amount	$ 1,014
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Class A Common Stock
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember	us-gaap:CommonClassAMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investments, amortized cost	$ 1,941	$ 1,941
Investments, at fair value	$ 157	$ 188
Percent of net assets	0.05%	0.05%	0.05%	0.05%	0.05%
Principal/Share Amount	$ 2	$ 2
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc First Lien Secured Term Loan C
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember	whf:FirstLienSecuredTermLoanCMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Spread Above Index	9.50%	9.50%	9.50%	9.50%	9.50%
Interest Rate	9.50%	9.50%	9.50%	9.50%	9.50%
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Investments, amortized cost	$ 1,265	$ 1,265
Investments, at fair value	$ 1,084	$ 1,219
Percent of net assets	0.32%	0.35%	0.32%	0.32%	0.35%
Principal/Share Amount	$ 1,268	$ 1,268
PIK interest rate	9.50%	9.50%	9.50%	9.50%	9.50%
Investment, interest rate, paid in cash	0.00%	0.00%	0.00%	0.00%	0.00%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Snap Fitness Holdings, Inc Warrants
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SnapFitnessHoldingsIncMember	whf:SnapFitnessHoldingsIncMember
Investment, Type [Extensible Enumeration]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]	Warrant [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities	Leisure Facilities
Acquisition Date	Jun. 29, 2020	Jun. 29, 2020
Maturity Date	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028	Jun. 28, 2028
Investments, amortized cost	$ 793	$ 793
Investments, at fair value	$ 64	$ 76
Percent of net assets	0.02%	0.02%	0.02%	0.02%	0.02%
Principal/Share Amount	$ 1	$ 1
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 8.94
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	9.74%		9.74%	9.74%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, at fair value	$ (10)
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Delayed Draw Loan Interest Rate 9.74
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	9.74%		9.74%	9.74%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 51
Investments, at fair value	$ 51
Percent of net assets	0.01%		0.01%	0.01%
Principal/Share Amount	$ 53
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan CDOR
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember		CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	10.92%		10.92%	10.92%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 2,726
Investments, at fair value	$ 2,704
Percent of net assets	0.79%		0.79%	0.79%
Principal/Share Amount			$ 3,839
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SF
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	9.74%		9.74%	9.74%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 2,706
Investments, at fair value	$ 2,706
Percent of net assets	0.79%		0.79%	0.79%
Principal/Share Amount	$ 2,783
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Solar Holdings Bidco Limited First Lien Secured Term Loan SONIA
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Solar Holdings Bidco Limited
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services		Environmental & Facilities Services	Environmental & Facilities Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	whf:SterlingOvernightIndexAverageMember		whf:SterlingOvernightIndexAverageMember	whf:SterlingOvernightIndexAverageMember
Floor	0.00%		0.00%	0.00%
Spread Above Index	6.75%		6.75%	6.75%
Interest Rate	8.94%		8.94%	8.94%
Acquisition Date	Sep. 30, 2022
Maturity Date	Sep. 28, 2029		Sep. 28, 2029	Sep. 28, 2029
Investments, amortized cost	$ 182
Investments, at fair value	$ 184
Percent of net assets	0.05%		0.05%	0.05%
Principal/Share Amount | £				£ 169
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredDelayedDrawLoanMember			whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Aug. 10, 2021
Maturity Date		Jul. 30, 2027			Jul. 30, 2027
Investments, at fair value		$ 1
Investment, Identifier [Axis]: Source Code Holdings, LLC , First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 7/30/2027
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Technology Hardware, Storage & Peripherals			Technology Hardware, Storage & Peripherals
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Aug. 10, 2021
Maturity Date		Jul. 30, 2027			Jul. 30, 2027
Investments, amortized cost		$ 7,487
Investments, at fair value		7,489
Principal/Share Amount		$ 7,629
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Acquisition Date	Aug. 10, 2021	Jul. 30, 2021
Maturity Date	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027
Investments, at fair value	$ 21
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Source Code Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SourceCodeHoldingsLLCMember	whf:SourceCodeHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.63%	7.50%	9.63%	9.63%	7.50%
Acquisition Date	Aug. 10, 2021	Jul. 30, 2021
Maturity Date	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027	Jul. 30, 2027
Investments, amortized cost	$ 14,899	$ 7,487
Investments, at fair value	14,970	$ 7,489
Percent of net assets		2.14%			2.14%
Principal/Share Amount	$ 15,143	$ 7,629
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.75%	6.75%	8.75%	8.75%	6.75%
Interest Rate	11.92%	7.75%	11.92%	11.92%	7.75%
Acquisition Date	Mar. 26, 2021	Dec. 29, 2020
Maturity Date	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025
Investments, amortized cost	$ 1,354	$ 1,877
Investments, at fair value	1,326	1,697
Principal/Share Amount	$ 1,367	$ 1,893
PIK interest rate	2.00%		2.00%	2.00%
Investment, interest rate, paid in cash	9.92%		9.92%	9.92%
Investment, Identifier [Axis]: Stella and Chewy's LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 12/16/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:StellaandChewysLLCMember	whf:StellaandChewysLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats	Packaged Foods & Meats
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	8.75%	6.75%	8.75%	8.75%	6.75%
Interest Rate	12.24%	7.75%	12.24%	12.24%	7.75%
Acquisition Date	Dec. 29, 2020	Dec. 29, 2020
Maturity Date	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025	Dec. 16, 2025
Investments, amortized cost	$ 3,826	$ 5,228
Investments, at fair value	3,758	4,967
Principal/Share Amount	$ 3,874	$ 5,313
PIK interest rate	2.00%		2.00%	2.00%
Investment, interest rate, paid in cash	10.24%		10.24%	10.24%
Investment, Identifier [Axis]: Sunless, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products		Personal Products	Personal Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]		London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	6.50%		6.50%	6.50%
Interest Rate	10.17%		10.17%	10.17%
Acquisition Date	Jun. 30, 2022
Maturity Date	Aug. 13, 2025		Aug. 13, 2025	Aug. 13, 2025
Investments, amortized cost	$ 2,053
Investments, at fair value	$ 2,063
Percent of net assets	0.60%		0.60%	0.60%
Principal/Share Amount	$ 2,092
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member	whf:SunlessIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.00%	6.50%	6.50%	6.00%
Interest Rate	10.17%	7.00%	10.17%	10.17%	7.00%
Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Maturity Date	Aug. 13, 2025	Aug. 13, 2024	Aug. 13, 2025	Aug. 13, 2025	Aug. 13, 2024
Investments, at fair value	$ 7	$ 14
Investment, Identifier [Axis]: Sunless, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 8/13/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:SunlessInc.Member	whf:SunlessIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Personal Products	Personal Products	Personal Products	Personal Products	Personal Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.00%	6.50%	6.50%	6.00%
Interest Rate	10.17%	7.00%	10.17%	10.17%	7.00%
Acquisition Date	Oct. 21, 2019	Oct. 21, 2019
Maturity Date	Aug. 13, 2025	Aug. 13, 2024	Aug. 13, 2025	Aug. 13, 2025	Aug. 13, 2024
Investments, amortized cost	$ 3,639	$ 4,185
Investments, at fair value	3,691	4,259
Principal/Share Amount	$ 3,691	$ 4,259
Investment, Identifier [Axis]: Sure Fit Home Products, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:SureFitHomeProductsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Home Furnishings			Home Furnishings
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		9.75%			9.75%
Interest Rate		10.75%			10.75%
Acquisition Date		Apr. 12, 2021
Maturity Date		Jul. 13, 2023			Jul. 13, 2023
Investments, amortized cost		$ 4,828
Investments, at fair value		$ 4,372
Percent of net assets		1.25%			1.25%
Principal/Share Amount		$ 4,912
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.62%	7.50%	9.62%	9.62%	7.50%
Acquisition Date	May 19, 2020	May 19, 2020
Maturity Date	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Investments, amortized cost	$ 2,493	$ 2,600
Investments, at fair value	2,505	2,616
Principal/Share Amount	$ 2,505	$ 2,616
Investment, Identifier [Axis]: TOUR Intermediate Holdings, LLC, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.50%, Rate 7.50%, Due 5/15/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TOURIntermediateHoldingsLLCMember	whf:TOURIntermediateHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage	Investment Banking & Brokerage
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.62%	7.50%	9.62%	9.62%	7.50%
Acquisition Date	May 19, 2020	May 19, 2020
Maturity Date	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025	May 15, 2025
Investments, amortized cost	$ 3,150	$ 7,343
Investments, at fair value	3,182	7,438
Principal/Share Amount	$ 3,182	$ 7,438
Investment, Identifier [Axis]: Team Car Care Holdings, First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TeamCarCareHoldingsLLCMember	whf:TeamCarCareHoldingsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Automotive Retail	Automotive Retail	Automotive Retail	Automotive Retail	Automotive Retail
Investment, Variable Interest Rate, Type [Extensible Enumeration]	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember	us-gaap:BaseRateMember
Floor	1.00%	1.03%	1.00%	1.00%	1.03%
Spread Above Index	7.98%	7.98%	7.98%	7.98%	7.98%
Interest Rate	10.39%	9.02%	10.39%	10.39%	9.02%
Acquisition Date	Feb. 16, 2018	Feb. 16, 2018
Maturity Date	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024	Jun. 28, 2024
Investments, amortized cost	$ 14,532	$ 15,193
Investments, at fair value	$ 14,594	$ 15,286
Percent of net assets	4.25%	4.37%	4.25%	4.25%	4.37%
Principal/Share Amount	$ 14,594	$ 15,286
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember		whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals		Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	1.00%		1.00%	1.00%
Spread Above Index	9.25%		9.25%	9.25%
Interest Rate	12.30%		12.30%	12.30%
Acquisition Date	May 12, 2022
Maturity Date	Oct. 15, 2025		Oct. 15, 2025	Oct. 15, 2025
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	9.25%	8.75%	9.25%	9.25%	8.75%
Interest Rate	12.30%	9.75%	12.30%	12.30%	9.75%
Acquisition Date	Oct. 15, 2020	Oct. 15, 2020
Maturity Date	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025
Investments, amortized cost	$ 909	$ 517
Investments, at fair value	$ 935	$ 549
Percent of net assets	0.27%	0.16%	0.27%	0.27%	0.16%
Principal/Share Amount	$ 927	$ 530
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Telestream Holdings Corporation First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	Telestream Holdings Corporation [Member]	Telestream Holdings Corporation [Member]
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals	Technology Hardware, Storage & Peripherals
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	9.25%	8.75%	9.25%	9.25%	8.75%
Interest Rate	12.11%	9.75%	12.11%	12.11%	9.75%
Acquisition Date	Oct. 15, 2020	Oct. 15, 2020
Maturity Date	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025	Oct. 15, 2025
Investments, amortized cost	$ 15,570	$ 14,713
Investments, at fair value	$ 15,874	$ 15,079
Percent of net assets	4.63%	4.31%	4.63%	4.63%	4.31%
Principal/Share Amount	$ 15,886	$ 15,079
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Tensar Corporation First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:TensarCorporationMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Nov. 20, 2020
Maturity Date		Aug. 20, 2025			Aug. 20, 2025
Investments, amortized cost		$ 6,797
Investments, at fair value		$ 7,069
Percent of net assets		2.02%			2.02%
Principal/Share Amount		$ 6,930
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Tensar Corporation, First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.75%, Rate 7.75%, Due 8/20/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:TensarCorporationMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Construction & Engineering			Construction & Engineering
Floor		1.00%			1.00%
Spread Above Index		6.75%			6.75%
Interest Rate		7.75%			7.75%
Acquisition Date		Nov. 24, 2020
Maturity Date		Aug. 20, 2025			Aug. 20, 2025
Investments, amortized cost		$ 6,797
Investments, at fair value		7,069
Principal/Share Amount		$ 6,930
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Products	Household Products	Household Products	Household Products	Household Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	6.50%	7.00%	7.00%	6.50%
Interest Rate	9.88%	7.50%	9.88%	9.88%	7.50%
Acquisition Date	Apr. 05, 2021	Apr. 05, 2021
Maturity Date	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026
Investments, amortized cost	$ 669	$ 380
Investments, at fair value	$ 632	$ 390
Percent of net assets	0.18%	0.11%	0.18%	0.18%	0.11%
Principal/Share Amount	$ 676	$ 385
PIK interest rate	0.50%		0.50%	0.50%
Investment, interest rate, paid in cash	9.38%		9.38%	9.38%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: The Kyjen Company, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TheKyjenCompanyLLCMember	whf:TheKyjenCompanyLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Products	Household Products	Household Products	Household Products	Household Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	7.00%	6.50%	7.00%	7.00%	6.50%
Interest Rate	10.31%	7.50%	10.31%	10.31%	7.50%
Acquisition Date	Apr. 05, 2021	Apr. 05, 2021
Maturity Date	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026	Apr. 05, 2026
Investments, amortized cost	$ 11,228	$ 11,257
Investments, at fair value	$ 10,782	$ 11,383
Percent of net assets	3.14%	3.25%	3.14%	3.14%	3.25%
Principal/Share Amount	$ 11,347	$ 11,403
PIK interest rate	0.50%		0.50%	0.50%
Investment, interest rate, paid in cash	9.81%		9.81%	9.81%
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Token Buyer, Inc First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments		Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TokenBuyerIncMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember		whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember		srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Household Appliances		Household Appliances	Household Appliances
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]		Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Floor	0.50%		0.50%	0.50%
Spread Above Index	6.00%		6.00%	6.00%
Interest Rate	9.70%		9.70%	9.70%
Acquisition Date	May 26, 2022
Maturity Date	May 31, 2029		May 31, 2029	May 31, 2029
Investments, amortized cost	$ 6,040
Investments, at fair value	$ 6,003
Percent of net assets	1.75%		1.75%	1.75%
Principal/Share Amount	$ 6,540
Investment, Restriction Status [true false]	true		true	true
Investment, Significant Unobservable Input [true false]	true		true	true
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Revolving Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:TrimliteBuyerLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredRevolvingLoanMember			whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Building Products			Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Jul. 27, 2021
Maturity Date		Jul. 27, 2026			Jul. 27, 2026
Investments, amortized cost		$ 161
Investments, at fair value		$ 161
Percent of net assets		0.05%			0.05%
Principal/Share Amount		$ 164
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: Trimlite Buyer LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TrimliteBuyerLLCMember	whf:TrimliteBuyerLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Building Products	Building Products	Building Products	Building Products	Building Products
Investment, Variable Interest Rate, Type [Extensible Enumeration]	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember	CanadianDollarOfferedRateMember
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	10.67%	7.50%	10.67%	10.67%	7.50%
Acquisition Date	Jul. 27, 2021	Jul. 27, 2021
Maturity Date	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026	Jul. 27, 2026
Investments, amortized cost	$ 17,681	$ 17,975
Investments, at fair value	$ 16,175	$ 17,841
Percent of net assets	4.72%	5.10%	4.72%	4.72%	5.10%
Principal/Share Amount		$ 22,977	$ 22,544
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Delayed Draw Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.50%	6.82%	6.50%	6.50%	6.82%
Interest Rate	9.55%	7.82%	9.55%	9.55%	7.82%
Acquisition Date	Oct. 17, 2019	Oct. 17, 2019
Maturity Date	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024
Investments, amortized cost	$ 4,124	$ 3,073
Investments, at fair value	$ 4,103	$ 3,098
Percent of net assets	1.20%	0.89%	1.20%	1.20%	0.89%
Principal/Share Amount	$ 4,186	$ 3,103
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: True Blue Car Wash, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:TrueBlueCarWashLLCMember	whf:TrueBlueCarWashLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services	Specialized Consumer Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]	London Interbank Offered Rate (LIBOR) [Member]
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.88%	6.82%	6.88%	6.88%	6.82%
Interest Rate	10.01%	7.82%	10.01%	10.01%	7.82%
Acquisition Date	Oct. 17, 2019	Oct. 17, 2019
Maturity Date	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024	Oct. 17, 2024
Investments, amortized cost	$ 9,876	$ 8,087
Investments, at fair value	$ 9,898	$ 8,130
Percent of net assets	2.89%	2.32%	2.89%	2.89%	2.32%
Principal/Share Amount	$ 9,969	$ 8,203
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Revolving Loan, Floor 3.25%, Spread P plus 5.00%, Rate 8.25%, Due 9/2/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	3.25%	1.00%	1.00%	3.25%
Spread Above Index	5.00%	5.00%	5.00%	5.00%	5.00%
Interest Rate	11.25%	8.25%	11.25%	11.25%	8.25%
Acquisition Date	Aug. 10, 2021	Aug. 10, 2021
Maturity Date	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026
Investments, amortized cost	$ 21	$ 84
Investments, at fair value	17	85
Principal/Share Amount	$ 22	$ 86
Investment, Identifier [Axis]: Turnberry Solutions, Inc., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 9/2/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:TurnberrySolutionsInc.Member	whf:TurnberrySolutionsInc.Member
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services	IT Consulting And Other Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	6.00%	6.00%	6.00%	6.00%	6.00%
Interest Rate	9.19%	7.00%	9.19%	9.19%	7.00%
Acquisition Date	Aug. 10, 2021	Aug. 10, 2021
Maturity Date	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026	Sep. 02, 2026
Investments, amortized cost	$ 6,008	$ 5,689
Investments, at fair value	5,973	5,684
Principal/Share Amount	$ 6,103	$ 5,791
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Delayed Draw Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember	whf:FirstLienSecuredDelayedDrawLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.50%	5.50%	5.50%	5.50%	5.50%
Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investments, amortized cost	$ 5,091	$ 5,083
Investments, at fair value	5,151	5,082
Principal/Share Amount	$ 5,133	$ 5,133
Investment, Identifier [Axis]: Unleashed Brands, LLC, First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.56%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.50%	5.50%	5.50%	5.50%	5.50%
Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investments, at fair value	$ 6
Investment, Identifier [Axis]: Unleashed Brands, LLC, First lien Secured Term Loan, Floor 1.00%, Spread L plus 5.50%, Rate 7.17%, Due 11/19/2026
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:UnleashedBrandsLLCMember	whf:UnleashedBrandsLLCMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Leisure Products	Leisure Products	Leisure Products	Leisure Products	Leisure Products
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.50%	5.50%	5.50%	5.50%	5.50%
Interest Rate	8.62%	6.50%	8.62%	8.62%	6.50%
Acquisition Date	Nov. 30, 2021	Nov. 30, 2021
Maturity Date	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026	Nov. 19, 2026
Investments, amortized cost	$ 3,854	$ 3,848
Investments, at fair value	3,887	3,848
Principal/Share Amount	$ 3,887	$ 3,887
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Revolving Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember	whf:WHLessorCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember	whf:FirstLienSecuredRevolvingLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.59%	6.00%	5.59%	5.59%	6.00%
Interest Rate	8.70%	7.00%	8.70%	8.70%	7.00%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024
Investments, at fair value	$ 5	$ 6
Investment, Identifier [Axis]: WH Lessor Corp., First Lien Secured Term Loan, Floor 1.00%, Spread L plus 6.00%, Rate 7.00%, Due 12/26/2024
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:JuniperLandscapingHoldingsLLCMember	whf:WHLessorCorpMember
Investment, Type [Extensible Enumeration]	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember	whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services	Environmental & Facilities Services
Floor	1.00%	1.00%	1.00%	1.00%	1.00%
Spread Above Index	5.59%	6.00%	5.59%	5.59%	6.00%
Interest Rate	8.70%	7.00%	8.70%	8.70%	7.00%
Acquisition Date	Jan. 22, 2020	Jan. 22, 2020
Maturity Date	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024	Dec. 26, 2024
Investments, amortized cost	$ 7,412	$ 6,780
Investments, at fair value	7,489	6,866
Principal/Share Amount	$ 7,490	$ 6,870
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Equity
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment, Type [Extensible Enumeration]	Equity Investments	Equity Investments	Equity Investments	Equity Investments	Equity Investments
Investments, at fair value	$ 22,066	$ 15,607				10,167
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Interests
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundMember	whf:WHFSTRSOhioSeniorLoanFundMember
Investment, Type [Extensible Enumeration]	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember	whf:LLCInterestsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investments, amortized cost	$ 20,000	$ 15,000
Investments, at fair value	$ 22,066	$ 15,607
Percent of net assets	6.43%	4.46%	6.43%	6.43%	4.46%
Principal/Share Amount	$ 20,000	$ 15,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false
Investment, Identifier [Axis]: WHF STRS Ohio Senior Loan Fund LLC Subordinated Note
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments	Controlled affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:WHFSTRSOhioSeniorLoanFundLLCMember	whf:WHFSTRSOhioSeniorLoanFundLLCMember
Investment, Type [Extensible Enumeration]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]	Subordinated Debt [Member]
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance	Specialized Finance
Investment, Variable Interest Rate, Type [Extensible Enumeration]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]	London Interbank Offered Rate (LIBOR) [Member]
Spread Above Index	6.50%	6.50%	6.50%	6.50%	6.50%
Interest Rate	9.13%	6.61%	9.13%	9.13%	6.61%
Acquisition Date	Jul. 19, 2019	Jul. 19, 2019
Investments, amortized cost	$ 80,000	$ 60,000
Investments, at fair value	$ 80,000	$ 60,000				$ 41,073
Percent of net assets	23.32%	17.16%	23.32%	23.32%	17.16%
Principal/Share Amount	$ 80,000	$ 60,000
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Identifier [Axis]: Westrock Coffee Company, LLC, First Lien Secured Term Loan, Floor 1.50%, Spread L plus 8.50%, Rate Westrock Coffee Company, LLC, Due 2/28/2025
Schedule of Investments [Line Items]
Investment, Issuer Name [Extensible Enumeration]		whf:WestrockCoffeeCompanyLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Packaged Foods & Meats			Packaged Foods & Meats
Floor		1.50%			1.50%
Spread Above Index		8.50%			8.50%
Interest Rate		10.00%			10.00%
Acquisition Date		Mar. 20, 2020
Maturity Date		Feb. 28, 2025			Feb. 28, 2025
Investments, amortized cost		$ 9,033
Investments, at fair value		8,923
Principal/Share Amount		$ 9,105
PIK interest rate		0.25%			0.25%
Investment, interest rate, paid in cash		9.75%			9.75%
Investment, Identifier [Axis]: What If Holdings, LLC First Lien Secured Term Loan
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]		Non-controlled/non-affiliate company investments			Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]		whf:WhatIfHoldingsLLCMember
Investment, Type [Extensible Enumeration]		whf:FirstLienSecuredTermLoanMember			whf:FirstLienSecuredTermLoanMember
Investment, Issuer Geographic Region [Extensible Enumeration]		srt:NorthAmericaMember			srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]		Interactive Media & Services			Interactive Media & Services
Investment, Variable Interest Rate, Type [Extensible Enumeration]		London Interbank Offered Rate (LIBOR) [Member]			London Interbank Offered Rate (LIBOR) [Member]
Floor		1.00%			1.00%
Spread Above Index		6.50%			6.50%
Interest Rate		7.50%			7.50%
Acquisition Date		Oct. 02, 2019
Maturity Date		Oct. 02, 2024			Oct. 02, 2024
Investments, amortized cost		$ 18,609
Investments, at fair value		$ 18,759
Percent of net assets		5.36%			5.36%
Principal/Share Amount		$ 18,848
Investment, Restriction Status [true false]		true			true
Investment, Significant Unobservable Input [true false]		true			true
Investment, Identifier [Axis]: What If Media Group, LLC Common Units
Schedule of Investments [Line Items]
Investment, Issuer Affiliation [Extensible Enumeration]	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments	Non-controlled/non-affiliate company investments
Investment, Issuer Name [Extensible Enumeration]	whf:WhatIfMediaGroupLLCMember	whf:WhatIfMediaGroupLLCMember
Investment, Type [Extensible Enumeration]	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember	whf:CommonUnitsMember
Investment, Issuer Geographic Region [Extensible Enumeration]	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember	srt:NorthAmericaMember
Investment, Industry Sector [Extensible Enumeration]	Interactive Media & Services	Interactive Media & Services	Interactive Media & Services	Interactive Media & Services	Interactive Media & Services
Acquisition Date	Jul. 02, 2021	Jul. 02, 2021
Investments, amortized cost	$ 851	$ 850
Investments, at fair value	$ 2,327	$ 1,398
Percent of net assets	0.68%	0.40%	0.68%	0.68%	0.40%
Principal/Share Amount	$ 851	$ 8
Investment, Restriction Status [true false]	true	true	true	true	true
Investment, Significant Unobservable Input [true false]	true	true	true	true	true
Investment, Non-income Producing [true false]	false	false	false	false	false