Note 14 - Leases - Summary of Components of Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Lease cost
Operating lease cost	$ 196	$ 229
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	167	232
Right-of-use assets obtained in exchange for lease obligations:
Right-of-use assets obtained in exchange for new operating lease liabilities	248	0
Finance leases	$ 0	$ 0