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Note 6 - Stock-based Compensation - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Outstanding (in shares) 510,361  
Outstanding (in dollars per share) $ 75.78  
Outstanding (in dollars per share) $ 84.27 $ 75.78
Outstanding (Year) 5 years 5 years
Outstanding $ 33,701 $ 23,956
Stock options granted (in shares) 93,435  
Stock options granted (in dollars per share) $ 122.77  
Stock options granted (Year) 5 years 292 days  
Stock options forfeited (in shares) (5,866)  
Stock options forfeited (in dollars per share) $ 96.96  
Stock options forfeited (Year) 5 years 146 days  
Stock options expired (in shares)  
Stock options expired (in dollars per share)  
Exercisable (in shares) 185,614  
Stock options expired (Year)  
Stock options exercised (in shares) (27,135)  
Exercisable (in dollars per share) $ 61.10  
Exercisable (Year) 4 years 73 days  
Exercisable $ 15,260  
Stock options exercised (in dollars per share) $ 54.41  
Outstanding (in shares) 570,795 510,361