FINANCIAL HIGHLIGHTS (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) $ / shares shares	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)
Per Share Data:
Net asset value at beginning of period			$ 13.26	$ 14.02
Net investment income			1.29	1.42
Change in unrealized appreciation (depreciation) on investments			1.05	(1.14)
Net realized loss			(0.87)	0.01
Benefit (provision) for taxes on net unrealized depreciation (appreciation) on investments			0.01	(0.01)
Total from operations			1.48	0.28
Sales load			(0.02)	(0.04)
Offering costs			(0.01)	(0.01)
Net investment income			(1.21)	(1.22)
Accretive effect of stock offerings (issuing shares above net asset value per share)			0.02	0.10
Other			0.03	0.06
Net asset value at end of period	$ 13.55	$ 13.19	13.55	13.19
Per share market value at end of period			$ 13.69	$ 14.07
Total return based on market value			15.00%	10.40%
Weighted average common shares, Basic (in shares) | shares	26,326,426	22,824,221	25,066,626	21,289,880
Weighted average common shares, Diluted (in shares) | shares	26,326,426	22,824,221	25,066,626	21,289,880
Ratio/Supplemental Data:
Net assets at end of period | $	$ 366,285,287	$ 318,125,780	$ 366,285,287	$ 318,125,780	$ 319,939,788
Weighted average net assets | $	$ 334,932,796	$ 294,999,242	$ 334,932,796	$ 294,999,242
Annualized ratio of gross operating expenses to net assets	19.30	21.59	19.30	21.59
Annualized ratio of net operating expenses to net assets	18.57	21.59	18.57	21.59
Annualized ratio of interest expense and other fees to net assets	9.48	10.89	9.48	10.89
Annualized ratio of net investment income before fee waiver to net assets	12.12	13.73	12.12	13.73
Annualized ratio of net investment income to net assets			12.84%	13.73%
Portfolio turnover	13.07	12.11	13.07	12.11
Notes payable | $	$ 100,000,000	$ 100,000,000	$ 100,000,000	$ 100,000,000
Credit Facility payable | $	157,374,851	162,306,499	157,374,851	162,306,499
SBA-guaranteed debentures | $	$ 325,000,000	$ 325,000,000	$ 325,000,000	$ 325,000,000
Asset coverage ratio	2.42	2.21	2.42	2.21
Income tax benefit (provision) on net unrealized depreciation (appreciation) in taxable subsidiaries | $			$ 188,893	$ (144,425)
Percentage impact of tax on net unrealized appreciation to net assets			0.0008%	(0.0007%)
Benefit for taxes on net realized loss on investments | $	$ 2,221		$ 2,221