NATURE OF OPERATIONS AND SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)	12 Months Ended									127 Months Ended
	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 ($) shares	Dec. 31, 2022 USD ($) shares	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Nature of Operation And Significant Accounting Policies [Line Items]
Issuance of common stock, net of offering costs (shares) | shares	149,174	31,592	354,257	3,177,936	7,931	3,465,922	380,936	63,998	12,035,023	19,666,769
Gross Proceeds	$ 2,070,935	$ 449,515	$ 5,023,843	$ 45,862,995	$ 93,737	$ 48,741,406	$ 5,485,780	$ 899,964	$ 180,522,093	$ 289,150,268
Proceeds for offering expenses and sales load fees										9,853,174
Offering expenses reimbursements										195,829
Proceeds from the issuance of common stock	2,158,540	449,515	4,794,994							279,492,923
Credit Facility payable	$ 197,685,281	175,451,116				$ 40,750,000	$ 106,500,000	$ 9,000,000		$ 197,685,281	$ 116,000,000	$ 109,500,000
Asset coverage ratio	192									192
Cash balance	$ 1,963,950									$ 1,963,950
Cash equivalents and carried at cost	46,079,109									46,079,109
Cash held in foreign currency	270									270
Cash held in foreign currency at acquisition cost	143
Deferred offering costs	$ 1,100	14,888								1,100	$ 261,761
At-the-Market Offering
Nature of Operation And Significant Accounting Policies [Line Items]
Issuance of common stock, net of offering costs (shares) | shares	149,174
Gross Proceeds	$ 2,070,935	449,515	$ 4,794,994
Proceeds from the issuance of common stock	2,127,474
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	$ 163,600,000	$ 100,000,000								$ 163,600,000