Note 14 - Leases - Summary of Components of Lease Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Lease cost
Operating lease cost	$ 229	$ 255
Finance lease cost	0	0
Amortization of right-of-use assets	0	0
Interest on lease liabilities	0	0
Variable lease costs	0	0
Total lease cost	229	255
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	232	257
Operating cash flows from finance leases	0	0
Financing cash flows from finance leases	0	0
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	0	403
Finance leases	$ 0	$ 0