Note 5 - Leases - Balance Sheet Information (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Operating lease right-of-use asset	$ 2,788	$ 2,841
Total right-of-use assets	2,788	2,841
Operating lease liability, current	164	160
Operating lease liability, non-current	2,713	2,752
Total lease liabilities	$ 2,877	$ 2,912