Note 2 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net (loss)	$ (153)	$ (632)	$ (1,230)	$ (1,547)
Weighted average shares outstanding
Basic (in shares)	21,043	21,043	21,043	21,043
Net loss per share:
Basic loss per share (in dollars per share)	$ (0.01)	$ (0.03)	$ (0.06)	$ (0.07)