FINANCIAL HIGHLIGHTS (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)
Per Share Data:(1)
Net asset value at beginning of period			$ 14.61	$ 14.03
Net investment income			0.97	0.75
Change in unrealized (depreciation) appreciation on investments			(0.66)	0.20
Net realized gain			0.24	0.34
Loss on debt extinguishment				(0.03)
Provision for taxes on unrealized appreciation on investments			(0.01)	(0.03)
Provision for taxes on realized gain on investments				(0.03)
Total from operations			0.54	1.20
Sales load			0.00
Offering costs			(0.01)
Net investment income			(0.96)	(1.08)
Net asset value at end of period	$ 14.18	$ 14.15	14.18	14.15
Per share market value at end of period			$ 11.93	$ 13.06
Total return based on market value(2)			(2.30%)	25.90%
Weighted average common shares Basic | shares	19,545,935	19,486,003	19,535,708	19,486,003
Weighted average common shares Diluted | shares	19,545,935	19,486,003	19,535,708	19,486,003
Ratio/Supplemental Data:(1)
Net assets at end of period | $	$ 277,177,984	$ 275,644,969	$ 277,177,984	$ 275,644,969
Weighted average net assets | $	$ 283,289,645	$ 273,663,257	$ 283,289,645	$ 273,663,257
Annualized ratio of gross operating expenses to net assets(5)	15.57	15.59	15.57	15.59
Annualized ratio of interest expense and other fees to net assets	7.96	6.78	7.96	6.78
Annualized ratio of net investment income to net assets(5)			8.91%	6.95%
Portfolio turnover(3)	8.92	17.17	8.92	17.17
Notes payable | $	$ 98,437,095		$ 98,437,095		$ 98,102,973
Credit Facility payable | $	197,371,231		197,371,231		$ 175,451,116
SBA-guaranteed debentures | $	$ 306,000,000	$ 250,000	$ 306,000,000	$ 250,000
Asset coverage ratio(4)	1.93	1.95	1.93	1.95
Income tax (provision) benefit on net unrealized appreciation (depreciation) in taxable subsidiaries | $			$ 151,278	$ (586,640)
Percentage Impact of tax on net unrealized appreciation (depreciation) to net assets			0.07%	0.29%