Note 11 - Earnings Per Share - Summary of Reconciliations Between the Numerator and the Denominator of the Basic and Diluted Earnings Per Share Computations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Net (loss) income	$ (472)	$ 520
Basic (in shares)	6,204	6,117
Basic (in dollars per share)	$ (0.08)	$ 0.09
Shares outstanding - basic (in shares)	6,204	6,117
Earnings per share - basic (in dollars per share)	$ (0.08)	$ 0.09
Effective dilutive securities – common stock options and restricted stock units (in shares)		176
Net income - diluted		$ 520
Shares outstanding - diluted (in shares)	6,204	6,293
Diluted income per share (in dollars per share)	$ (0.08)	$ 0.08