PORTFOLIO INVESTMENTS AND FAIR VALUE - Industry Concentration of Investment Portfolio (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 941,679,195	$ 875,823,177
Fair value of investments	$ 886,338,148	$ 844,733,638
% of Total Investments at fair value	100.00%	100.00%
Services: Business
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 194,990,932	$ 207,234,534
Fair value of investments	$ 205,918,323	$ 218,866,572
% of Total Investments at fair value	23.24%	25.91%
Healthcare & Pharmaceuticals
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 101,206,823	$ 86,469,854
Fair value of investments	$ 103,092,547	$ 88,103,319
% of Total Investments at fair value	11.63%	10.43%
Aerospace & Defense
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 47,005,893	$ 48,137,394
Fair value of investments	$ 24,062,870	$ 39,526,086
% of Total Investments at fair value	2.71%	4.68%
Consumer Goods: Non-Durable
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 53,777,908	$ 54,683,102
Fair value of investments	$ 47,396,634	$ 51,280,593
% of Total Investments at fair value	5.35%	6.07%
Media: Advertising, Printing & Publishing
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 38,356,963	$ 52,830,447
Fair value of investments	$ 39,217,942	$ 52,525,839
% of Total Investments at fair value	4.42%	6.22%
Consumer Goods: Durable
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 58,800,939	$ 45,601,928
Fair value of investments	$ 53,974,812	$ 44,529,176
% of Total Investments at fair value	6.09%	5.27%
Beverage, Food, & Tobacco
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 43,077,877	$ 34,000,918
Fair value of investments	$ 44,406,932	$ 32,755,054
% of Total Investments at fair value	5.01%	3.88%
Media: Broadcasting & Subscription
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 17,988,173	$ 18,615,052
Fair value of investments	$ 20,946,799	$ 21,445,307
% of Total Investments at fair value	2.36%	2.54%
Chemicals, Plastics, & Rubber
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 18,354,804	$ 18,487,206
Fair value of investments	$ 17,040,958	$ 17,903,999
% of Total Investments at fair value	1.92%	2.12%
Software
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 40,113,229	$ 37,582,855
Fair value of investments	$ 40,956,717	$ 37,975,255
% of Total Investments at fair value	4.62%	4.50%
Capital Equipment
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 37,303,170	$ 33,538,647
Fair value of investments	$ 38,576,803	$ 33,801,951
% of Total Investments at fair value	4.35%	4.00%
Construction & Building
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 30,622,390	$ 26,948,135
Fair value of investments	$ 30,577,354	$ 26,406,849
% of Total Investments at fair value	3.45%	3.13%
Environmental Industries
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 35,547,983	$ 27,771,798
Fair value of investments	$ 23,613,946	$ 26,247,936
% of Total Investments at fair value	2.66%	3.11%
Services: Consumer
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 50,310,688	$ 43,302,101
Fair value of investments	$ 32,337,514	$ 24,616,706
% of Total Investments at fair value	3.65%	2.92%
Transportation & Logistics
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 16,689,791	$ 16,768,763
Fair value of investments	$ 17,185,165	$ 17,161,972
% of Total Investments at fair value	1.94%	2.03%
Containers, Packaging, & Glass
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 17,382,901	$ 17,436,600
Fair value of investments	$ 14,651,952	$ 13,977,250
% of Total Investments at fair value	1.65%	1.65%
Retail
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 14,919,849	$ 13,303,536
Fair value of investments	$ 14,805,752	$ 13,217,256
% of Total Investments at fair value	1.67%	1.56%
High Tech Industries
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 51,932,243	$ 14,126,954
Fair value of investments	$ 51,454,412	$ 12,648,347
% of Total Investments at fair value	5.81%	1.50%
Metals & Mining
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 16,612,448	$ 16,708,750
Fair value of investments	$ 16,585,405	$ 16,464,001
% of Total Investments at fair value	1.87%	1.95%
FIRE: Real Estate
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 16,946,623	$ 15,642,093
Fair value of investments	$ 5,406,899	$ 5,866,397
% of Total Investments at fair value	0.61%	0.69%
Automotive
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 11,137,278	$ 11,252,581
Fair value of investments	$ 11,250,000	$ 11,342,751
% of Total Investments at fair value	1.27%	1.34%
Education
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 10,269,911	$ 11,057,921
Fair value of investments	$ 9,183,346	$ 10,498,760
% of Total Investments at fair value	1.04%	1.24%
Utilities: Oil & Gas
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 9,937,449	$ 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	$ 1,516,860	$ 7,355,074
% of Total Investments at fair value	0.17%	0.87%
Finance
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 1,554,039	$ 1,568,900
Fair value of investments	$ 5,555,214	$ 4,082,579
% of Total Investments at fair value	0.63%	0.48%
Hotel, Gaming, & Leisure
Investment Holdings 1 [Line Items]
Fair value of investments	$ 881,962	$ 799,899
% of Total Investments at fair value	0.10%	0.09%
Media: Diversified & Production
Investment Holdings 1 [Line Items]
Investments, amortized cost	$ 5,649,003	$ 5,517,409
Fair value of investments	$ 5,741,030	$ 5,534,710
% of Total Investments at fair value	0.65%	0.66%