Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Nov. 10, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2022
Securities Act File Number	814-00967
Entity Registrant Name	WHITEHORSE FINANCE, INC
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-4247759
Entity Address, State or Province	FL
Entity Address, Address Line One	1450 Brickell Avenue
Entity Address, Address Line Two	31st Floor
Entity Address, City or Town	Miami
Entity Address, Postal Zip Code	33131
City Area Code	305
Local Phone Number	381-6999
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	WHF
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		23,243,088
Entity Central Index Key	0001552198
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Amendment Flag	false