PORTFOLIO INVESTMENTS AND FAIR VALUE - Industry Concentration of Investment Portfolio (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Investment Holdings [Line Items]
Investments, amortized cost	$ 912,581,782	$ 875,823,177
Fair value of investments	$ 877,493,781	$ 844,733,638
% of Total Investments at fair value	100.00%	100.00%
Services: Business
Investment Holdings [Line Items]
Investments, amortized cost	$ 214,938,285	$ 207,234,534
Fair value of investments	$ 225,555,095	$ 218,866,572
% of Total Investments at fair value	25.70%	25.91%
Healthcare & Pharmaceuticals
Investment Holdings [Line Items]
Investments, amortized cost	$ 90,768,290	$ 86,469,854
Fair value of investments	$ 91,838,092	$ 88,103,319
% of Total Investments at fair value	10.47%	10.43%
Aerospace & Defense
Investment Holdings [Line Items]
Investments, amortized cost	$ 48,175,509	$ 48,137,394
Fair value of investments	$ 37,969,299	$ 39,526,086
% of Total Investments at fair value	4.33%	4.68%
Consumer Goods: Non-Durable
Investment Holdings [Line Items]
Investments, amortized cost	$ 54,573,002	$ 54,683,102
Fair value of investments	$ 51,799,071	$ 51,280,593
% of Total Investments at fair value	5.90%	6.07%
Media: Advertising, Printing & Publishing
Investment Holdings [Line Items]
Investments, amortized cost	$ 52,707,992	$ 52,830,447
Fair value of investments	$ 52,833,166	$ 52,525,839
% of Total Investments at fair value	6.02%	6.22%
Consumer Goods: Durable
Investment Holdings [Line Items]
Investments, amortized cost	$ 59,536,778	$ 45,601,928
Fair value of investments	$ 56,844,795	$ 44,529,176
% of Total Investments at fair value	6.48%	5.27%
Beverage, Food, & Tobacco
Investment Holdings [Line Items]
Investments, amortized cost	$ 44,255,730	$ 34,000,918
Fair value of investments	$ 43,826,641	$ 32,755,054
% of Total Investments at fair value	4.99%	3.88%
Media: Broadcasting & Subscription
Investment Holdings [Line Items]
Investments, amortized cost	$ 18,587,328	$ 18,615,052
Fair value of investments	$ 21,616,919	$ 21,445,307
% of Total Investments at fair value	2.46%	2.54%
Chemicals, Plastics, & Rubber
Investment Holdings [Line Items]
Investments, amortized cost	$ 18,482,917	$ 18,487,206
Fair value of investments	$ 17,699,203	$ 17,903,999
% of Total Investments at fair value	2.02%	2.12%
Software
Investment Holdings [Line Items]
Investments, amortized cost	$ 37,504,347	$ 37,582,855
Fair value of investments	$ 37,740,143	$ 37,975,255
% of Total Investments at fair value	4.30%	4.50%
Capital Equipment
Investment Holdings [Line Items]
Investments, amortized cost	$ 33,548,956	$ 33,538,647
Fair value of investments	$ 34,006,902	$ 33,801,951
% of Total Investments at fair value	3.88%	4.00%
Construction & Building
Investment Holdings [Line Items]
Investments, amortized cost	$ 26,868,234	$ 26,948,135
Fair value of investments	$ 26,527,191	$ 26,406,849
% of Total Investments at fair value	3.02%	3.13%
Environmental Industries
Investment Holdings [Line Items]
Investments, amortized cost	$ 27,675,169	$ 27,771,798
Fair value of investments	$ 25,341,098	$ 26,247,936
% of Total Investments at fair value	2.89%	3.11%
Services: Consumer
Investment Holdings [Line Items]
Investments, amortized cost	$ 43,347,965	$ 43,302,101
Fair value of investments	$ 24,770,484	$ 24,616,706
% of Total Investments at fair value	2.83%	2.92%
Transportation & Logistics
Investment Holdings [Line Items]
Investments, amortized cost	$ 16,742,199	$ 16,768,763
Fair value of investments	$ 17,115,334	$ 17,161,972
% of Total Investments at fair value	1.95%	2.03%
Containers, Packaging, & Glass
Investment Holdings [Line Items]
Investments, amortized cost	$ 17,442,042	$ 17,436,600
Fair value of investments	$ 14,035,836	$ 13,977,250
% of Total Investments at fair value	1.60%	1.65%
Retail
Investment Holdings [Line Items]
Investments, amortized cost	$ 14,961,662	$ 13,303,536
Fair value of investments	$ 14,936,630	$ 13,217,256
% of Total Investments at fair value	1.70%	1.56%
High Tech Industries
Investment Holdings [Line Items]
Investments, amortized cost	$ 14,105,434	$ 14,126,954
Fair value of investments	$ 13,006,779	$ 12,648,347
% of Total Investments at fair value	1.48%	1.50%
Metals & Mining
Investment Holdings [Line Items]
Investments, amortized cost	$ 16,676,543	$ 16,708,750
Fair value of investments	$ 16,504,906	$ 16,464,001
% of Total Investments at fair value	1.88%	1.95%
FIRE: Real Estate
Investment Holdings [Line Items]
Investments, amortized cost	$ 15,648,928	$ 15,642,093
Fair value of investments	$ 3,661,577	$ 5,866,397
% of Total Investments at fair value	0.42%	0.69%
Automotive
Investment Holdings [Line Items]
Investments, amortized cost	$ 11,115,290	$ 11,252,581
Fair value of investments	$ 11,193,750	$ 11,342,751
% of Total Investments at fair value	1.28%	1.34%
Education
Investment Holdings [Line Items]
Investments, amortized cost	$ 11,039,366	$ 11,057,921
Fair value of investments	$ 10,349,882	$ 10,498,760
% of Total Investments at fair value	1.18%	1.24%
Utilities: Oil & Gas
Investment Holdings [Line Items]
Investments, amortized cost	$ 9,926,667	$ 9,921,469
Fair value of investments	$ 9,850,000	$ 9,800,000
% of Total Investments at fair value	1.12%	1.16%
Energy: Oil & Gas
Investment Holdings [Line Items]
Investments, amortized cost	$ 6,821,814	$ 7,314,230
Fair value of investments	$ 6,958,701	$ 7,355,074
% of Total Investments at fair value	0.79%	0.87%
Finance
Investment Holdings [Line Items]
Investments, amortized cost	$ 1,568,063	$ 1,568,900
Fair value of investments	$ 5,092,591	$ 4,082,579
% of Total Investments at fair value	0.58%	0.48%
Hotel, Gaming, & Leisure
Investment Holdings [Line Items]
Fair value of investments	$ 812,272	$ 799,899
% of Total Investments at fair value	0.09%	0.09%
Media: Diversified & Production
Investment Holdings [Line Items]
Investments, amortized cost	$ 5,563,272	$ 5,517,409
Fair value of investments	$ 5,607,424	$ 5,534,710
% of Total Investments at fair value	0.64%	0.66%