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, 2025	Jun. 30, 2025	Sep. 30, 2024	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Numerator:
Net (loss)	$ (1,043)	$ (1,140)	$ (881)	$ (962)	$ (2,183)	$ (1,843)
Weighted average shares outstanding
Basic (in shares)	21,042,652		21,042,652		21,042,652	21,042,652
Net (loss) per share:
Basic (loss) per share (in dollars per share)	$ (0.05)		$ (0.04)		$ (0.1)	$ (0.09)