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Note 2 - Net Income Per Share - Reconciliation of the Numerators and Denominators of the Basic and Diluted Net Income per Share Computations (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Net income (numerator):        
Net income $ 9,064 $ 4,823 $ 27,100 $ 16,316
Shares (denominator):        
Weighted average number of common shares outstanding used in basic computation (in shares) 20,368 20,253 20,337 20,223
Common shares issuable upon vesting of restricted stock (in shares) 47 145 90 140
Common shares issuable upon conversion of preferred shares (in shares) 10 10 10 10
Shares used in diluted computation (in shares) 20,425 20,408 20,437 20,373
Net income per common share        
Basic (in dollars per share) $ 0.45 $ 0.24 $ 1.33 $ 0.81
Diluted (in dollars per share) $ 0.44 $ 0.24 $ 1.33 $ 0.80