Note 14 - Leases - Summary of Components of Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Lease cost
Operating lease cost	$ 191	$ 196
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	187	167
Right-of-use assets obtained in exchange for lease obligations:
Right-of-use assets obtained in exchange for new operating lease liabilities	313	248
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 6	$ 0