Note 9 - Leases - Summary of Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Lease cost
Operating lease cost	$ 60	$ 64	$ 185	$ 191
Finance lease cost	0	0	0	0
Amortization of right-of-use assets	0	0	0	0
Interest on lease liabilities	0	0	0	0
Variable lease costs	0	0	0	0
Total lease cost	60	64	185	191
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	62	63	187	194
Operating cash flows from finance leases	0	0	0	0
Financing cash flows from finance leases	0	0	0	0
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	0	403	0	403
Finance leases	$ 0	$ 0	$ 0	$ 0