Note 10 - Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Income Tax Expense (Benefit)	$ 0	$ 0	$ 0	$ 0
Effective Income Tax Rate Reconciliation, Percent	0.00%	0.00%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ Details