PORTFOLIO INVESTMENTS AND FAIR VALUE - Industry concentration of investment portfolio (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Investment Holdings [Line Items]
Investments, amortized cost	$ 899,059,872	$ 785,005,957
Fair value of investments	$ 871,733,280	772,873,326
% of Total Investments at fair value	100.00%
Services: Business
Investment Holdings [Line Items]
Fair value of investments	$ 216,144,996	$ 177,242,299
% of Total Investments at fair value	24.80%	22.93%
Healthcare & Pharmaceuticals
Investment Holdings [Line Items]
Fair value of investments	$ 83,081,912	$ 99,584,343
% of Total Investments at fair value	9.53%	12.89%
Aerospace & Defense
Investment Holdings [Line Items]
Fair value of investments	$ 42,197,058	$ 63,467,579
% of Total Investments at fair value	4.84%	8.21%
Consumer Goods: Non-Durable
Investment Holdings [Line Items]
Fair value of investments	$ 52,204,827	$ 29,447,632
% of Total Investments at fair value	5.99%	3.81%
Media: Advertising, Printing & Publishing
Investment Holdings [Line Items]
Fair value of investments	$ 52,545,237	$ 51,125,659
% of Total Investments at fair value	6.03%	6.62%
Consumer Goods: Durable
Investment Holdings [Line Items]
Fair value of investments	$ 45,631,242	$ 36,537,445
% of Total Investments at fair value	5.23%	4.73%
Beverage, Food, & Tobacco
Investment Holdings [Line Items]
Fair value of investments	$ 32,515,226	$ 33,791,047
% of Total Investments at fair value	3.73%	4.37%
Media: Broadcasting & Subscription
Investment Holdings [Line Items]
Fair value of investments	$ 31,094,050	$ 42,892,137
% of Total Investments at fair value	3.57%	5.55%
Chemicals, Plastics, & Rubber
Investment Holdings [Line Items]
Fair value of investments	$ 29,310,956	$ 14,288,322
% of Total Investments at fair value	3.36%	1.85%
Software
Investment Holdings [Line Items]
Fair value of investments	$ 38,124,297	$ 23,841,617
% of Total Investments at fair value	4.37%	3.08%
Capital Equipment
Investment Holdings [Line Items]
Fair value of investments	$ 41,772,219	$ 8,182,736
% of Total Investments at fair value	4.79%	1.06%
Construction & Building
Investment Holdings [Line Items]
Fair value of investments	$ 26,382,118	$ 27,282,504
% of Total Investments at fair value	3.03%	3.53%
Environmental Industries
Investment Holdings [Line Items]
Fair value of investments	$ 26,742,482	$ 26,355,789
% of Total Investments at fair value	3.07%	3.41%
Services: Consumer
Investment Holdings [Line Items]
Fair value of investments	$ 24,404,811	$ 22,682,119
% of Total Investments at fair value	2.80%	2.93%
Transportation & Logistics
Investment Holdings [Line Items]
Fair value of investments	$ 17,417,956	$ 18,934,004
% of Total Investments at fair value	2.00%	2.45%
Containers, Packaging, & Glass
Investment Holdings [Line Items]
Fair value of investments	$ 14,528,718	$ 17,710,907
% of Total Investments at fair value	1.67%	2.29%
Retail
Investment Holdings [Line Items]
Fair value of investments	$ 13,303,091
% of Total Investments at fair value	1.53%
High Tech Industries
Investment Holdings [Line Items]
Fair value of investments	$ 12,046,313
% of Total Investments at fair value	1.38%
Metals & Mining
Investment Holdings [Line Items]
Fair value of investments	$ 16,591,093	$ 16,974,999
% of Total Investments at fair value	1.90%	2.20%
FIRE: Real Estate
Investment Holdings [Line Items]
Fair value of investments	$ 11,303,322	$ 15,824,998
% of Total Investments at fair value	1.30%	2.05%
Automotive
Investment Holdings [Line Items]
Fair value of investments	$ 11,197,250	$ 10,800,000
% of Total Investments at fair value	1.28%	1.40%
Education
Investment Holdings [Line Items]
Fair value of investments	$ 10,409,233	$ 11,053,167
% of Total Investments at fair value	1.19%	1.43%
Utilities: Oil & Gas
Investment Holdings [Line Items]
Fair value of investments	$ 9,800,000	$ 9,800,000
% of Total Investments at fair value	1.12%	1.27%
Energy: Oil & Gas
Investment Holdings [Line Items]
Fair value of investments	$ 8,590,797	$ 10,461,417
% of Total Investments at fair value	0.99%	1.35%
Finance
Investment Holdings [Line Items]
Fair value of investments	$ 3,413,460	$ 4,108,356
% of Total Investments at fair value	0.39%	0.53%
Hotel, Gaming, & Leisure
Investment Holdings [Line Items]
Fair value of investments	$ 685,208	$ 484,250
% of Total Investments at fair value	0.08%	0.06%
Media: Diversified & Production
Investment Holdings [Line Items]
Fair value of investments	$ 295,408
% of Total Investments at fair value	0.03%