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Note 9 - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Outstanding (in shares) 437,248 398,172 416,125  
Weighted-Average Exercise Price per Share (in dollars per share) $ 55.81 $ 38.75 $ 29.87  
Weighted-Average Remaining Contractual Term 5 years 73 days 4 years 328 days 4 years 146 days 3 years 255 days
Aggregate Intrinsic Value $ 9,445 $ 20,505 $ 9,529  
Granted (in shares) 184,030 147,720 128,124  
Granted (in dollars per share) $ 72.89 $ 88.62 $ 55.33  
Granted 6 years 255 days 7 years 6 years 146 days  
Forfeited (in shares) (16,334) (26,466) (27,782)  
Forfeited (in dollars per share) $ 75.16 $ 64.62 $ 52.50  
Expired (in shares)     (410)  
Expired (in dollars per share) $ 52.50  
Exercised (in shares) (89,224) (82,178) (117,885)  
Exercised (in dollars per share) $ 38.28 $ 28.87 $ 22.17  
Outstanding (in shares) 515,720 437,248 398,172 416,125
Weighted-Average Exercise Price per Share (in dollars per share) $ 64.32 $ 55.81 $ 38.75 $ 29.87
Aggregate Intrinsic Value $ 16,561 $ 9,445 $ 20,505 $ 9,529
Forfeited 6 years 182 days      
2016 (in shares) 157,457 163,210 140,825  
2016 (in dollars per share) $ 42.49 $ 33.35 $ 26.70  
2016 3 years 219 days 3 years 219 days 3 years 182 days  
2016 $ 8,481 $ 6,341 $ 8,949