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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, 2019
Jun. 30, 2018
Net income (numerator):    
Net income $ 5,343 $ 12,582
Shares (denominator):    
Weighted average number of common shares outstanding used in basic computation (in shares) 20,235 20,408
Common shares issuable upon vesting of restricted stock (in shares) 31
Common shares issuable upon conversion of preferred shares (in shares) 10 10
Shares used in diluted computation (in shares) 20,245 20,449
Net income per common share    
Basic (in dollars per share) $ 0.26 $ 0.62
Diluted (in dollars per share) $ 0.26 $ 0.62