CONSOLIDATED STATEMENTS OF CASH FLOWS $ in Thousands	12 Months Ended
	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)
Cash flows from operating activities
Net increase in net assets from operations	$ 70,548	$ 83,389	$ 33,093
Adjustments to reconcile net increase in net assets from operations to net cash provided by (used in) operating activities:
Purchases and originations of investments	(620,464)	(497,486)	(433,200)
Proceeds from sales and repayments of debt investments in portfolio companies	276,924	191,407	139,051
Proceeds from sales and return of capital of equity investments in portfolio companies	17,987	4,131	2,664
Proceeds from return of capital of investment in I-45 SLF LLC	0	12,800	0
Payment of accreted original issue discounts	2,453	2,163	1,570
Payment of accrued payment-in-kind interest	975	0	1,313
Depreciation and amortization	5,865	4,304	2,750
Net pension benefit	(66)	(66)	(24)
Realized loss (gain) on investments before income tax	46,760	39,983	17,222
Realized loss on extinguishment of debt	387	361	0
Realized loss on disposal of fixed assets	20	0	0
Net unrealized (appreciation) depreciation on investments before income tax	(6,082)	(13,623)	12,075
Accretion of discounts on investments	(6,653)	(5,163)	(3,842)
Payment-in-kind interest	(12,930)	(11,234)	(5,965)
Share-based compensation expense	6,963	4,518	3,705
Deferred income taxes	4,782	(119)	6,369
Changes in other assets and liabilities:
Increase in dividend and interest receivable	(8,078)	(4,829)	(6,803)
(Increase) decrease in escrow receivables	(1,903)	272	756
Decrease (increase) in tax receivable	241	31	(209)
(Increase) decrease in other receivables	(1,753)	627	1,591
Increase in other assets	(1,380)	(706)	(128)
Increase (decrease) in taxes payable	2,487	126	(1,085)
Increase in other liabilities	5,659	618	1,997
Net cash used in operating activities	(217,258)	(188,496)	(227,100)
Cash flows from investing activities
Acquisition of fixed assets	(1,666)	(13)	(281)
Net cash used in investing activities	(1,666)	(13)	(281)
Cash flows from financing activities
Proceeds from common stock offering	178,493	181,453	202,956
Equity offering costs paid	0	0	(102)
Borrowings under Credit Facilities	368,000	305,000	185,000
Repayments of Credit Facilities	(290,000)	(275,000)	(155,000)
Debt issuance costs paid	(1,560)	(10,183)	(1,248)
Proceeds from issuance of SBA Debentures	21,464	32,196	78,052
Proceeds from issuance of 2029 Convertible Notes	223,100	0	0
Proceeds from issuance of August 2028 Notes	0	69,719	0
Redemption of January 2026 Notes	(140,000)	0	0
Dividends to shareholders	(125,267)	(102,925)	(71,102)
Common stock withheld for payroll taxes upon vesting of restricted stock	(2,708)	(1,063)	(1,021)
Net cash provided by financing activities	231,522	199,197	237,535
Net increase (decrease) in cash, cash equivalents and restricted cash	12,598	10,688	10,154
Cash and cash equivalents at beginning of period	32,273	21,585	11,431
Cash, cash equivalents and restricted cash at end of period	44,871	32,273	21,585
Supplemental cash flow disclosures:
Cash paid for income taxes	1,443	1,176	1,896
Cash paid for interest	46,586	37,753	25,466
Distributions in kind received	0	72,481	0
Total cash, cash equivalents and restricted cash presented in the Consolidated Statements of Cash Flows
Cash and cash equivalents	43,221	32,273	21,585
Restricted cash	1,650	0	0
Total cash, cash equivalents and restricted cash presented in the Consolidated Statements of Cash Flows	$ 44,871	$ 32,273	$ 21,585