SUMMARY OF PER SHARE INFORMATION (Details) - $ / shares	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Mar. 31, 2024
Per Share Data:
Investment income (in usd per share)	$ 1.13	$ 1.07
Operating expenses (in usd per share)	(0.44)	(0.40)
Income taxes (in usd per share)	(0.06)	(0.02)
Net investment income (in usd per share)	0.63	0.65
Net realized gain (loss), net of tax (in usd per share)	0.02	(0.34)
Net unrealized (depreciation) appreciation on investments, net of tax (in usd per share)	(0.34)	0.32
Total increase from investment operations (in usd per share)	0.31	0.63
Accretive effect of share issuances and repurchases (in usd per share)	0.27	0.09
Dividends to shareholders (in usd per share)	(0.63)	(0.59)
Issuance of restricted stock (in usd per share)	(0.13)	(0.13)
Common stock withheld for payroll taxes upon vesting of restricted stock (in usd per share)	(0.07)	(0.05)
Share based compensation expense (in usd per share)	0.03	0.02
Other (in usd per share)	0.05	0.04
Increase (decrease) in net asset value (in usd per share)	(0.17)	0.01
Net asset value
Beginning of period (in usd per share)	16.77	16.37
End of period (in usd per share)	$ 16.60	$ 16.38
Ratios and Supplemental Data
Ratio of operating expenses to average net assets	10.35%	9.88%
Ratio of operating expenses (excluding interest expense) to average net assets	3.93%	3.65%
Ratio of net investment income to average net assets	14.88%	15.80%
Portfolio turnover	6.22%	2.26%
Total investment return	7.05%	14.23%
Total return based on change in NAV	2.74%	3.67%
Per share market value at the end of the period (in usd per share)	$ 26.09	$ 19.72
Weighted-average basic shares outstanding (in share)	45,665,387	37,597,884
Weighted-average diluted shares outstanding (in share)	45,665,387	37,597,884
Common shares outstanding at end of period (in shares)	46,837,511	38,840,000	45,050,759