Note 12 - 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		9 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Net income	$ 386	$ 827	$ 1,877	$ 1,121
Shares outstanding - basic (in shares)	6,183	6,097	6,144	6,060
Earnings per share - basic (in dollars per share)	$ 0.06	$ 0.14	$ 0.31	$ 0.18
Effective dilutive securities – common stock options and restricted stock units (in shares)	188	125	75	109
Net income - diluted	$ 386	$ 827	$ 1,877	$ 1,121
Shares outstanding - diluted (in shares)	6,371	6,222	6,219	6,169
Diluted income per share (in dollars per share)	$ 0.06	$ 0.13	$ 0.30	$ 0.18