Note 8 - Leases - Undiscounted Future Lease Payments Under Operating Leases and Financial Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Mar. 31, 2023	Oct. 01, 2022
Balance of 2024, operating	$ 1,701
Balance of 2024, financing	3,765
2025, operating	6,447
2025, financing	5,301
2026, operating	4,652
2026, financing	4,210
2027, operating	3,520
2027, financing	3,152
2028, operating	3,269
2028, financing	2,774
2029-2034, operating	2,969
2029-2034, financing	2,964
Total minimum payment required, operating	22,558
Total minimum payment required, financing	22,166
Less interest, operating	2,277
Less interest, financing	1,883
Present value of minimum lease payments, operating	20,281
Present value of minimum lease payments, financing	20,283
Long-term lease obligations, operating	13,995	$ 16,675	$ 16,508
Long-term lease obligations, financing	14,202	$ 17,293	$ 18,499
Current Portion of Long-term Debt and Lease Obligations [Member]
Amount due within one year, operating	6,286
Amount due within one year, financing	$ 6,081