Note 2 - Summary of Significant Accounting Policies - Schedule of Financial Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Mar. 31, 2025
Estimate of Fair Value Measurement [Member]
Cash and restricted cash	$ 8,414	$ 1,400
Cash equivalents	11,363	23,429
Reported Value Measurement [Member]
Cash and restricted cash	8,414	1,400
Cash equivalents	11,363	23,429
Fair Value, Inputs, Level 1 [Member]
Cash and restricted cash	8,414	1,400
Cash equivalents	11,363	23,429
Fair Value, Inputs, Level 2 [Member]
Cash and restricted cash	0	0
Cash equivalents	0	0
Fair Value, Inputs, Level 3 [Member]
Cash and restricted cash	0	0
Cash equivalents	$ 0	$ 0