Note 2 - Net Income (Loss) 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, 2024	Jun. 30, 2024	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net (loss) income	$ (881)	$ (962)	$ 2,635	$ (565)	$ (1,843)	$ 2,070
Weighted average shares outstanding
Basic (in shares)	21,042,652		21,042,652		21,042,652	21,042,652
Net (loss) income per share:
Basic (loss) income per share (in dollars per share)	$ (0.04)		$ 0.13		$ (0.09)	$ 0.1