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Note 3 - Net Income Per Share - Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Net income (numerator):    
Net income $ 4,428 $ 7,768
Shares (denominator):    
Weighted average number of common shares outstanding used in basic computation (in shares) 20,109 19,984
Common shares issuable upon vesting of restricted stock (in shares) 81 48
Common shares issuable upon conversion of preferred shares (in shares) 10 10
Shares used in diluted computation (in shares) 20,200 20,042
Net income per common share    
Basic (in dollars per share) $ 0.22 $ 0.39
Diluted (in dollars per share) $ 0.22 $ 0.39