Note 5 - Income Taxes - Reconciliation of Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Statutory provision	$ 180	$ (286)
Foreign subsidiary	(248)	(162)
State taxes	55	(86)
Permanent differences	261	148
Adjustment to prior year taxes	86	(8)
Valuation allowance	(244)	394
Provision for income tax expense	$ 90	$ 0