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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 6 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Net income (numerator):        
Net income $ 8,412 $ 6,665 $ 16,180 $ 12,008
Shares (denominator):        
Weighted average number of common shares outstanding used in basic computation (in shares) 20,063 19,963 20,024 20,098
Common shares issuable upon vesting of restricted stock (in shares) 81 0 64 1
Common shares issuable upon conversion of preferred shares (in shares) 10 10 10 10
Shares used in diluted computation (in shares) 20,154 19,973 20,098 20,109
Net income per common share        
Basic (in dollars per share) $ 0.42 $ 0.33 $ 0.81 $ 0.60
Diluted (in dollars per share) $ 0.42 $ 0.33 $ 0.81 $ 0.60