Note 6 - Indebtedness - Interest Expense on the Notes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Term Loan [Member]
Interest expense	$ 1,159	$ 1,450	$ 3,756	$ 4,551
Amortization of debt issuance costs	43	38	118	111
Total interest and amortization of debt issuance costs	1,202	1,488	3,874	4,662
Coupon interest expense at 1.375%	1,159	1,450	3,756	4,551
Amortization of debt issuance costs	43	38	118	111
The Notes [Member]
Interest expense	0	335	503	1,037
Amortization of debt issuance costs	0	134	203	412
Total interest and amortization of debt issuance costs	0	469	706	1,449
Coupon interest expense at 1.375%	0	335	503	1,037
Amortization of debt issuance costs	$ 0	$ 134	$ 203	$ 412