PORTFOLIO INVESTMENTS AND FAIR VALUE - Industry Concentration of Investment Portfolio (Details) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 922,796,573	$ 875,823,177
Fair value of investments	$ 881,666,450	$ 844,733,638
% of Total Investments at fair value	100.00%	100.00%
Services: Business
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 226,995,642	$ 207,234,534
Fair value of investments	$ 238,878,500	$ 218,866,572
% of Total Investments at fair value	27.08%	25.91%
Healthcare & Pharmaceuticals
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 91,205,161	$ 86,469,854
Fair value of investments	$ 93,077,808	$ 88,103,319
% of Total Investments at fair value	10.55%	10.43%
Aerospace & Defense
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 48,298,034	$ 48,137,394
Fair value of investments	$ 27,295,618	$ 39,526,086
% of Total Investments at fair value	3.10%	4.68%
Consumer Goods: Non-Durable
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 53,958,284	$ 54,683,102
Fair value of investments	$ 51,766,867	$ 51,280,593
% of Total Investments at fair value	5.87%	6.07%
Media: Advertising, Printing & Publishing
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 38,363,033	$ 52,830,447
Fair value of investments	$ 39,057,251	$ 52,525,839
% of Total Investments at fair value	4.43%	6.22%
Consumer Goods: Durable
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 59,270,223	$ 45,601,928
Fair value of investments	$ 54,567,910	$ 44,529,176
% of Total Investments at fair value	6.19%	5.27%
Beverage, Food, & Tobacco
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 42,884,147	$ 34,000,918
Fair value of investments	$ 43,786,560	$ 32,755,054
% of Total Investments at fair value	4.97%	3.88%
Media: Broadcasting & Subscription
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 17,629,649	$ 18,615,052
Fair value of investments	$ 20,591,975	$ 21,445,307
% of Total Investments at fair value	2.34%	2.54%
Chemicals, Plastics, & Rubber
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 18,425,715	$ 18,487,206
Fair value of investments	$ 17,735,387	$ 17,903,999
% of Total Investments at fair value	2.01%	2.12%
Software
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 37,337,635	$ 37,582,855
Fair value of investments	$ 38,288,078	$ 37,975,255
% of Total Investments at fair value	4.34%	4.50%
Capital Equipment
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 37,366,328	$ 33,538,647
Fair value of investments	$ 38,468,901	$ 33,801,951
% of Total Investments at fair value	4.36%	4.00%
Construction & Building
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 26,044,832	$ 26,948,135
Fair value of investments	$ 25,825,768	$ 26,406,849
% of Total Investments at fair value	2.93%	3.13%
Environmental Industries
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 28,202,747	$ 27,771,798
Fair value of investments	$ 25,420,361	$ 26,247,936
% of Total Investments at fair value	2.88%	3.11%
Services: Consumer
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 50,281,462	$ 43,302,101
Fair value of investments	$ 32,320,593	$ 24,616,706
% of Total Investments at fair value	3.67%	2.92%
Transportation & Logistics
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 16,715,873	$ 16,768,763
Fair value of investments	$ 17,160,188	$ 17,161,972
% of Total Investments at fair value	1.95%	2.03%
Containers, Packaging, & Glass
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 17,412,372	$ 17,436,600
Fair value of investments	$ 14,424,156	$ 13,977,250
% of Total Investments at fair value	1.64%	1.65%
Retail
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 14,953,930	$ 13,303,536
Fair value of investments	$ 14,921,785	$ 13,217,256
% of Total Investments at fair value	1.69%	1.56%
High Tech Industries
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 24,592,803	$ 14,126,954
Fair value of investments	$ 23,803,603	$ 12,648,347
% of Total Investments at fair value	2.70%	1.50%
Metals & Mining
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 16,644,442	$ 16,708,750
Fair value of investments	$ 16,545,375	$ 16,464,001
% of Total Investments at fair value	1.88%	1.95%
FIRE: Real Estate
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 16,438,619	$ 15,642,093
Fair value of investments	$ 4,202,469	$ 5,866,397
% of Total Investments at fair value	0.48%	0.69%
Automotive
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 11,126,155	$ 11,252,581
Fair value of investments	$ 11,250,000	$ 11,342,751
% of Total Investments at fair value	1.28%	1.34%
Education
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 10,288,745	$ 11,057,921
Fair value of investments	$ 9,402,698	$ 10,498,760
% of Total Investments at fair value	1.07%	1.24%
Utilities: Oil & Gas
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 9,931,992	$ 9,921,469
Fair value of investments	$ 10,000,000	$ 9,800,000
% of Total Investments at fair value	1.13%	1.16%
Energy: Oil & Gas
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 1,189,888	$ 7,314,230
Fair value of investments	$ 1,487,383	$ 7,355,074
% of Total Investments at fair value	0.17%	0.87%
Finance
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 1,562,775	$ 1,568,900
Fair value of investments	$ 4,779,849	$ 4,082,579
% of Total Investments at fair value	0.54%	0.48%
Hotel, Gaming, & Leisure
Investment Holdings 1 [Line Items]
Fair value of investments	$ 831,130	$ 799,899
% of Total Investments at fair value	0.09%	0.09%
Media: Diversified & Production
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 5,676,087	$ 5,517,409
Fair value of investments	$ 5,776,237	$ 5,534,710
% of Total Investments at fair value	0.66%	0.66%