Consolidated Statements of Changes in Net Assets (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Balance	$ 746,753,790	$ 829,456,636
Accounting Standards Update Extensible List	us-gaap:AccountingStandardsUpdate202006CumulativeEffectPeriodOfAdoptionMember	us-gaap:AccountingStandardsUpdate202006CumulativeEffectPeriodOfAdoptionMember
Net investment income	$ 25,373,127	$ 19,753,940
Net realized and unrealized gain (loss)	(2,659,248)	(7,304,980)
Dividends paid to shareholders	(18,485,524)	(17,330,179)
Balance	$ 750,982,145	$ 824,462,328
Balance (Shares)	57,767,264	57,767,264
Cumulative Effect Adjustment for the Adoption | ASU 2020-06
Balance		$ (113,089)
Common Stock
Balance	$ 57,767	$ 57,767
Balance (Shares)	57,767,264	57,767,264
Balance	$ 57,767	$ 57,767
Balance (Shares)	57,767,264	57,767,264
Paid in Capital in Excess of Par
Balance	$ 967,890,570	$ 966,409,911
Balance	967,890,570	963,100,315
Paid in Capital in Excess of Par | Cumulative Effect Adjustment for the Adoption | ASU 2020-06
Balance		(3,309,596)
Distributable earnings (loss)
Balance	(221,194,547)	(137,011,042)
Net investment income	25,373,127	19,753,940
Net realized and unrealized gain (loss)	(2,659,248)	(7,304,980)
Dividends paid to shareholders	(18,485,524)	(17,330,179)
Balance	$ (216,966,192)	(138,695,754)
Distributable earnings (loss) | Cumulative Effect Adjustment for the Adoption | ASU 2020-06
Balance		$ 3,196,507