CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net increase in net assets from operations	$ 83,389	$ 33,093	$ 42,815
Adjustments to reconcile net increase in net assets from operations to net cash used in operating activities:
Purchases and originations of investments	(497,486)	(433,200)	(499,218)
Proceeds from sales and repayments of debt investments in portfolio companies	191,407	139,051	259,158
Proceeds from sales and return of capital of equity investments in portfolio companies	4,131	2,664	11,881
Proceeds from return of capital of investment in I-45 SLF LLC	12,800	0	0
Payment of accreted original issue discounts	2,163	1,570	3,692
Payment of accrued payment-in-kind interest	0	1,313	3,485
Depreciation and amortization	4,304	2,750	2,230
Net pension benefit	(66)	(24)	(132)
Realized loss (gain) on investments before income tax	39,983	17,222	(6,617)
Realized loss on extinguishment of debt	361	0	17,103
Realized loss on disposal of fixed assets	0	0	86
Net unrealized (appreciation) depreciation on investments before income tax	(13,623)	12,075	(13,435)
Accretion of discounts on investments	(5,163)	(3,842)	(3,005)
Payment-in-kind interest	(11,234)	(5,965)	(4,190)
Share-based compensation expense	4,518	3,705	3,585
Deferred income taxes	(119)	6,369	2,402
Changes in other assets and liabilities:
Increase in dividend and interest receivable	(4,829)	(6,803)	(1,539)
Decrease (increase) in escrow receivables	272	756	(159)
Decrease (increase) in tax receivable	31	(209)	(4)
Decrease (increase) in other receivables	627	1,591	(2,067)
Increase in other assets	(706)	(128)	(3,090)
Increase (decrease) in taxes payable	126	(1,085)	1,191
Increase in other liabilities	618	1,997	3,153
Net cash used in operating activities	(188,496)	(227,100)	(182,675)
Cash flows from investing activities
Acquisition of fixed assets	(13)	(281)	(1,995)
Net cash used in investing activities	(13)	(281)	(1,995)
Cash flows from financing activities
Proceeds from common stock offering	181,453	202,956	98,141
Equity offering costs paid	0	(102)	0
Borrowings under credit facility	305,000	185,000	315,000
Repayments of credit facility	(275,000)	(155,000)	(230,000)
Debt issuance costs paid	(10,183)	(1,248)	(3,865)
Proceeds from issuance of SBA Debentures	32,196	78,052	39,026
Payment for debt extinguishment costs	0	0	(15,196)
Dividends to shareholders	(102,925)	(71,102)	(58,624)
Common stock withheld for payroll taxes upon vesting of restricted stock	(1,063)	(1,021)	(1,408)
Net cash provided by financing activities	199,197	237,535	164,488
Net increase in cash and cash equivalents	10,688	10,154	(20,182)
Cash and cash equivalents at beginning of period	21,585	11,431	31,613
Cash and cash equivalents at end of period	32,273	21,585	11,431
Supplemental cash flow disclosures:
Cash paid for income taxes	1,176	1,896	461
Cash paid for interest	37,753	25,466	18,404
Distributions in kind received	72,481	0	0
October 2026 Notes
Cash flows from financing activities
Proceeds from issuance of Notes	0	0	146,414
August 2028 Notes
Cash flows from financing activities
Proceeds from issuance of Notes	69,719	0	0
October 2024 Notes
Cash flows from financing activities
Redemption of October 2024 Notes	$ 0	$ 0	$ (125,000)