CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net increase in net assets from operations	$ 33,093	$ 42,815	$ 50,883
Adjustments to reconcile net increase in net assets from operations to net cash used in operating activities:
Purchases and originations of investments	(433,200)	(499,218)	(219,349)
Proceeds from sales and repayments of debt investments in portfolio companies	139,051	259,158	97,589
Proceeds from sales and return of capital of equity investments in portfolio companies	2,664	11,881	17,841
Payment of accreted original issue discounts	1,570	3,692	1,228
Payment of accrued payment-in-kind interest	1,313	3,485	0
Depreciation and amortization	2,750	2,230	1,967
Net pension benefit	(24)	(132)	(110)
Realized loss (gain) on investments before income tax	17,222	(6,617)	8,549
Realized loss on extinguishment of debt	0	17,103	1,007
Realized loss on disposal of fixed assets	0	86	0
Net unrealized depreciation (appreciation) on investments before income tax	12,075	(13,435)	(30,991)
Accretion of discounts on investments	(3,842)	(3,005)	(2,347)
Payment-in-kind interest	(5,965)	(4,190)	(7,880)
Share-based compensation expense	3,705	3,585	2,944
Deferred income taxes	6,369	2,402	3,784
Changes in other assets and liabilities:
(Increase) decrease in dividend and interest receivable	(6,803)	(1,539)	(144)
Decrease (increase) in escrow receivables	756	(159)	493
(Increase) decrease in tax receivable	(209)	(4)	(8)
Decrease (increase) in other receivables	1,591	(2,067)	(119)
(Increase) decrease in other assets	(128)	(3,090)	95
(Decrease) increase in taxes payable	(1,085)	1,191	(463)
Increase in other liabilities	1,997	3,153	6,779
Net cash used in operating activities	(227,100)	(182,675)	(68,252)
Cash flows from investing activities
Acquisition of fixed assets	(281)	(1,995)	0
Net cash used in investing activities	(281)	(1,995)	0
Cash flows from financing activities
Proceeds from common stock offering	202,956	98,141	50,410
Equity offering costs paid	(102)	0	0
Borrowings under credit facility	185,000	315,000	182,000
Repayments of credit facility	(155,000)	(230,000)	(216,000)
Debt issuance costs paid	(1,248)	(3,865)	(540)
Proceeds from issuance of SBA Debentures	78,052	39,026	0
Payment for debt extinguishment costs	0	(15,196)	0
Dividends to shareholders	(71,102)	(58,624)	(39,945)
Common stock withheld for payroll taxes upon vesting of restricted stock	(1,021)	(1,408)	(239)
Net cash provided by financing activities	237,535	164,488	86,121
Net increase (decrease) in cash and cash equivalents	10,154	(20,182)	17,869
Cash and cash equivalents at beginning of period	11,431	31,613	13,744
Cash and cash equivalents at end of period	21,585	11,431	31,613
Supplemental cash flow disclosures:
Cash paid for income taxes	1,896	461	1,464
Cash paid for interest	25,466	18,404	11,738
October 2024 Notes
Cash flows from financing activities
Proceeds from issuance of Notes	0	0	49,000
Redemption of Notes	0	(125,000)	0
January 2026 Notes
Cash flows from financing activities
Proceeds from issuance of Notes	0	0	138,571
October 2026 Notes
Cash flows from financing activities
Proceeds from issuance of Notes	0	146,414	0
December 2022 Notes
Cash flows from financing activities
Redemption of Notes	$ 0	$ 0	$ (77,136)