CONSOLIDATED STATEMENTS OF CHANGES IN NET ASSETS - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Investment Company, Net Assets [Roll Forward]
Beginning balance (in shares)	45,050,759
Beginning balance	$ 755,676	$ 590,408
Issuance of common stock	37,778	44,872
Cancellation of treasury shares		0
Share-based compensation	1,224	963
Issuance of common stock under restricted stock plan, net of forfeitures	0	0
Common stock withheld for payroll taxes upon vesting of restricted stock	(1,862)	(926)
Dividends to shareholders	(29,508)	(22,916)
Change in restoration plan liability	(12)	(12)
Reclassification for certain permanent book-to-tax differences		0
Net investment income	28,859	24,556
Net realized (loss) gain on investments	711	(12,782)
Net unrealized depreciation (appreciation) on investments	$ (15,535)	$ 12,038
Ending balance (in shares)	46,837,511	38,840,000
Ending balance	$ 777,331	$ 636,201
Common Stock
Investment Company, Net Assets [Roll Forward]
Beginning balance (in shares)	45,050,759	36,076,425
Beginning balance	$ 11,263	$ 9,604
Issuance of common stock (in shares)	1,498,981	2,527,458
Issuance of common stock	$ 375	$ 632
Cancellation of treasury shares		$ (585)
Issuance of common stock under restricted stock plan, net of forfeitures (in shares)	359,000	282,616
Issuance of common stock under restricted stock plan, net of forfeitures	$ 89	$ 71
Common stock withheld for payroll taxes upon vesting of restricted stock (in shares)	(71,229)	(46,581)
Common stock withheld for payroll taxes upon vesting of restricted stock	$ (18)	$ (12)
Ending balance (in shares)	46,837,511	38,839,918
Ending balance	$ 11,709	$ 9,710
Treasury Stock
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 0	$ (23,937)
Beginning balance (in shares)	0	2,339,512
Cancellation of treasury shares		$ 23,937
Cancellation of treasury stock (in shares)		2,339,512
Ending balance	$ 0	$ 0
Ending balance (in shares)	0	0
Additional Paid-In Capital
Investment Company, Net Assets [Roll Forward]
Beginning balance	$ 796,945	$ 646,586
Issuance of common stock	37,403	44,240
Cancellation of treasury shares		(23,352)
Share-based compensation	1,224	963
Issuance of common stock under restricted stock plan, net of forfeitures	(89)	(71)
Common stock withheld for payroll taxes upon vesting of restricted stock	(1,844)	(914)
Change in restoration plan liability	(12)	(12)
Ending balance	833,627	667,440
Total Distributable Earnings (Loss)
Investment Company, Net Assets [Roll Forward]
Beginning balance	(52,532)	(41,845)
Dividends to shareholders	(29,508)	(22,916)
Net investment income	28,859	24,556
Net realized (loss) gain on investments	711	(12,782)
Net unrealized depreciation (appreciation) on investments	(15,535)	12,038
Ending balance	$ (68,005)	$ (40,949)