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Note 5 - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Outstanding (in shares) 515,720  
Outstanding (in dollars per share) $ 64.32  
Outstanding 5 years 73 days 5 years 73 days
Outstanding $ 30,601 $ 16,561
Stock options granted (in shares) 109,740  
Stock options granted (in dollars per share) $ 97.85  
Stock options granted 5 years 292 days  
Stock options forfeited (in shares) (2,398)  
Stock options forfeited (in dollars per share) $ 79.64  
Stock options forfeited 5 years 292 days  
Stock options expired (in shares) (142)  
Stock options expired (in dollars per share) $ 89.70  
Stock options expired 5 years 292 days  
Stock options exercised (in shares) (34,357)  
Stock options exercised (in dollars per share) $ 55.68  
Outstanding (in shares) 588,563 515,720
Outstanding (in dollars per share) $ 71.01 $ 64.32
Exercisable (in shares) 200,313  
Exercisable (in dollars per share) $ 49.01  
Exercisable 3 years 328 days  
Exercisable $ 14,821