NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	12 Months Ended											151 Months Ended
	Dec. 31, 2024 USD ($) segment shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($) shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 USD ($) shares	Dec. 31, 2024 USD ($) shares	Dec. 31, 2016 USD ($)
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Issuance of common stock, net of offering costs (shares) | shares	3,355,476	4,458,873	149,174	31,592	354,257	3,177,936	7,931	3,465,922	380,936	63,998	12,035,023	27,481,118
Gross Proceeds	$ 46,494,756	$ 62,871,349	$ 2,070,935	$ 449,515	$ 5,023,843	$ 45,862,995	$ 93,737	$ 48,741,406	$ 5,485,780	$ 899,964	$ 180,522,093	$ 398,516,373
Proceeds for offering expenses and sales load fees												12,177,679
Offering expenses reimbursements												672,917
Proceeds from the issuance of common stock	46,494,756	63,348,436	2,158,540									387,011,611
Credit Facility payable	$ 172,314,315	156,564,776										$ 172,314,315
Asset coverage ratio	234											234
Cash balance	$ 44,739											$ 44,739
Cash held in foreign currency	288											288
Cash held in foreign currency at acquisition cost	288
Offering Expenses	435,390	247,701	$ 530,842	$ 53,327	$ 84,592	$ 559,261		$ 307,021	$ 29,904		$ 835,500	3,083,538
Deferred Offering Costs	$ 0	7,312										0	$ 261,761
Number of operating segments | segment	1
Number of reportable segments | segment	1
Level 1
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Cash equivalents and carried at cost	$ 20,013,567											20,013,567
SBA-guaranteed Debentures
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Estimated fair values	312,011,555											312,011,555
SBA-guaranteed Debentures | Level 3
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Estimated fair values	312,011,555											312,011,555
2026 Notes | Level 2
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Estimated fair values	96,606,000											96,606,000
SBIC Subsidiary | SBA-guaranteed Debentures
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Maximum borrowing capacity	150,000,000											150,000,000
Regulatory capital	75,000,000	75,000,000										75,000,000
Credit Facility payable	150,000,000	150,000,000										150,000,000
SBIC II Subsidiary | SBA-guaranteed Debentures
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Maximum borrowing capacity	175,000,000											175,000,000
Regulatory capital	87,500,000	87,500,000										87,500,000
Credit Facility payable	$ 175,000,000	$ 175,000,000										$ 175,000,000