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, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ 171	$ 288	$ 266	$ (2,123)
Basic income per share, shares (in shares)	5,957	5,836	5,946	5,809
Basic income per share, per share amount (in dollars per share)	$ 0.03	$ 0.05	$ 0.04	$ (0.37)
Effect of dilutive securities on net income
Effect of dilutive securities, shares (in shares)	5	26	3
Diluted income per share, net income	$ 171	$ 288	$ 266
Diluted income per share, shares (in shares)	5,962	5,862	5,949	5,809
Diluted income per share, per share amount (in dollars per share)	$ 0.03	$ 0.05	$ 0.04	$ (0.37)
Shares outstanding - basic and diluted (in shares)				5,809
Basic and diluted loss per share (in dollars per share)				$ (0.37)