Note 2 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2023	Dec. 31, 2022
Numerator:
Net income (loss)	$ (421)	$ (241)	$ 1,649	$ (1,471)
Weighted average shares outstanding
Basic (in shares)	21,042,652	21,042,652	21,042,652	21,042,652
Net income (loss) per share:
Basic income (loss) per share (in dollars per share)	$ (0.02)	$ (0.01)	$ 0.08	$ (0.07)