Note 11 - Leases - Lease Cost (Details) - USD ($) $ in Thousands	9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Mar. 31, 2023
Fixed rent cost	$ 615	$ 373
Short term lease cost	88	46
Total operating lease cost	703	$ 419
Operating lease right-of-use assets	175		$ 423
Lease liabilities, current	181		273
Operating lease liability, noncurrent	0		161
Total operating lease liabilities	$ 181		$ 434