NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended										153 Months Ended
	Sep. 30, 2024 USD ($) shares	Jun. 30, 2024 USD ($) shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	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	Sep. 30, 2024 USD ($) shares
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Issuance of common stock, net of offering costs (shares) | shares	1,058,366	1,855,356			4,458,873	149,174	31,592	354,257	3,177,936	7,931	3,465,922	380,936	63,998	12,035,023	27,039,364
Gross Proceeds	$ 14,593,716	$ 25,777,185			$ 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	$ 392,392,518
Payments of offering expenses and underwriting fees															11,900,649
Offering expenses reimbursements															672,917
Proceeds from the issuance of common stock			$ 40,370,901	$ 63,348,436											381,164,786
Credit Facility payable	$ 154,578,467		$ 154,578,467		156,564,776										$ 154,578,467
Asset coverage ratio	242		242												242
Cash balance	$ 64,163		$ 64,163												$ 64,163
Cash held in foreign currency	724		724												724
Cash held in foreign currency at acquisition cost			724
Cash equivalents and carried at cost	38,516,098		38,516,098												38,516,098
SBA-guaranteed Debentures
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Estimated fair values	312,657,637		312,657,637												312,657,637
2026 Notes
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Estimated fair values	96,265,500		96,265,500												96,265,500
SBIC Subsidiary | SBA-guaranteed Debentures
NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES
Maximum borrowing capacity	150,000,000		150,000,000												150,000,000
Regulatory capital	75,000,000		75,000,000		75,000,000										75,000,000
Credit Facility payable	150,000,000		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												175,000,000
Regulatory capital	87,500,000		87,500,000		87,500,000										87,500,000
Credit Facility payable	$ 175,000,000		$ 175,000,000		$ 175,000,000										$ 175,000,000