CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Investment Company, Net Assets [Roll Forward]
Beginning balance (in shares)	52,912,796
Beginning balance	$ 883,633	$ 755,676
Issuance of common stock	41,172	37,778
Share-based compensation	1,143	1,224
Issuance of common stock under restricted stock plan, net of forfeitures	0	0
Common stock withheld for payroll taxes upon vesting of restricted stock	(1,120)	(1,862)
Dividends to shareholders	(35,344)	(29,508)
Change in restoration plan liability	(11)	(12)
Net investment income	31,889	28,859
Net realized (loss) gain on investments, net of tax	15,704	711
Net unrealized (depreciation) appreciation on investments	$ (20,592)	$ (15,535)
Ending balance (in shares)	55,227,370	46,838,000
Ending balance	$ 916,474	$ 777,331
Common Stock
Investment Company, Net Assets [Roll Forward]
Beginning balance (in shares)	52,912,796	45,050,759
Beginning balance	$ 13,228	$ 11,263
Issuance of common stock (in shares)	2,034,917	1,498,981
Issuance of common stock	$ 509	$ 375
Issuance of common stock under restricted stock plan, net of forfeitures (in shares)	332,250	359,000
Issuance of common stock under restricted stock plan, net of forfeitures	$ 83	$ 89
Common stock withheld for payroll taxes upon vesting of restricted stock (in shares)	(52,593)	(71,229)
Common stock withheld for payroll taxes upon vesting of restricted stock	$ (13)	$ (18)
Ending balance (in shares)	55,227,370	46,837,511
Ending balance	$ 13,807	$ 11,709
Treasury Stock
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 0	$ 0
Beginning balance (in shares)	0	0
Ending balance	$ 0	$ 0
Ending balance (in shares)	0	0
Additional Paid-In Capital
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 959,123	$ 796,945
Issuance of common stock	40,663	37,403
Share-based compensation	1,143	1,224
Issuance of common stock under restricted stock plan, net of forfeitures	(83)	(89)
Common stock withheld for payroll taxes upon vesting of restricted stock	(1,107)	(1,844)
Change in restoration plan liability	(11)	(12)
Ending balance	999,728	833,627
Total Distributable Earnings (Loss)
Investment Company, Net Assets [Roll Forward]
Beginning balance	(88,718)	(52,532)
Dividends to shareholders	(35,344)	(29,508)
Net investment income	31,889	28,859
Net realized (loss) gain on investments, net of tax	15,704	711
Net unrealized (depreciation) appreciation on investments	(20,592)	(15,535)
Ending balance	$ (97,061)	$ (68,005)