NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	12 Months Ended										139 Months Ended
	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, 2023 USD ($) shares	Dec. 31, 2016 USD ($)
Nature of Operation And Significant Accounting Policies [Line Items]
Issuance of common stock, net of offering costs (shares) | shares	4,458,873	149,174	31,592	354,257	3,177,936	7,931	3,465,922	380,936	63,998	12,035,023	24,125,642
Gross Proceeds	$ 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	$ 352,021,617
Proceeds for offering expenses and sales load fees											11,044,123
Offering expenses reimbursements											672,917
Proceeds from the issuance of common stock	63,348,436	2,158,540	449,515								341,650,411
Credit Facility payable	$ 156,564,776	197,685,281									$ 156,564,776
Asset coverage ratio	223										223
Cash balance	$ 925,548										$ 925,548
Cash exceeding the insured amount	675,548										675,548
Cash equivalents and carried at cost	25,199,894										25,199,894
Cash held in foreign currency	299										299
Cash held in foreign currency at acquisition cost	299
Offering Expenses	247,701	530,842	$ 53,327	$ 84,592	$ 559,261		$ 307,021	$ 29,904		$ 835,500	2,648,148
Deferred offering costs	7,312	1,100									7,312	$ 261,761
SBA-guaranteed Debentures
Nature of Operation And Significant Accounting Policies [Line Items]
Estimated fair values	293,215,000										293,215,000
2026 Notes
Nature of Operation And Significant Accounting Policies [Line Items]
Estimated fair values	93,041,000										93,041,000
SBIC Subsidiary | SBA-guaranteed Debentures
Nature of Operation And Significant Accounting Policies [Line Items]
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 Operation And Significant Accounting Policies [Line Items]
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	$ 163,600,000									$ 175,000,000