Note 5 - Income Taxes - Schedule of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Statement [Line Items]
Federal	$ 0	$ 0
Foreign, state and other	0	0
Federal	0	0
Foreign, state and other	0	0
Provision for income tax expense	$ 0	$ 0