Investments - Schedule of Investments (Details) - USD ($)	Dec. 31, 2022	Dec. 31, 2021
Schedule Of Investments [Line Items]
Investments, Cost	$ 658,300,164	$ 614,626,655
Investments, Fair Value	570,489,084	552,563,994
Senior Secured Notes
Schedule Of Investments [Line Items]
Investments, Cost	1,920,592	1,914,346
Investments, Fair Value	1,624,823	1,641,800
Unsecured Debt
Schedule Of Investments [Line Items]
Investments, Cost	37,686,148	41,861,533
Investments, Fair Value	15,228,000	21,927,071
Subordinated Debt
Schedule Of Investments [Line Items]
Investments, Cost	5,000,000	5,000,000
Investments, Fair Value	4,930,000	5,000,000
Senior Secured Loan, First Lien
Schedule Of Investments [Line Items]
Investments, Cost	455,458,846	405,193,486
Investments, Fair Value	447,490,518	409,626,942
Senior Secured Loan, Second/Other Priority Lien
Schedule Of Investments [Line Items]
Investments, Cost	98,468,621	100,726,036
Investments, Fair Value	90,992,663	101,878,924
Total Senior Secured Loans
Schedule Of Investments [Line Items]
Investments, Cost	553,927,467	505,919,522
Investments, Fair Value	538,483,181	511,505,866
Preferred Stock
Schedule Of Investments [Line Items]
Investments, Cost	40,527,223	40,192,521
Investments, Fair Value	2,354,224	2,680,424
Common Stock
Schedule Of Investments [Line Items]
Investments, Cost	10,611,548	10,611,548
Investments, Fair Value	0	0
Limited Partnership/Limited Liability Company Interests
Schedule Of Investments [Line Items]
Investments, Cost	8,511,838	9,011,837
Investments, Fair Value	5,991,648	7,475,576
Equity Warrants/Options
Schedule Of Investments [Line Items]
Investments, Cost	115,348	115,348
Investments, Fair Value	$ 1,877,208	$ 2,333,257