Note 2 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income (loss)	$ 2,635	$ (153)	$ 2,070	$ (1,230)
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)	$ 0.13	$ (0.01)	$ 0.1	$ (0.06)