Note 9 - Net Income (Loss) Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Numerator:
Net income (loss)	$ 766	$ (1,360)
Weighted average shares outstanding
Basic (in shares)	21,042,652	21,042,652
Net income (loss) per share:
Basic income (loss) per share (in dollars per share)	$ 0.04	$ (0.06)