XML 47 R36.htm IDEA: XBRL DOCUMENT v3.6.0.2
Note 5 - Stock-based Compensation - Summary of Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Dec. 31, 2016
Mar. 31, 2016
Outstanding (in shares) 515,720  
Outstanding (in dollars per share) $ 64.32  
Outstanding (Year) 4 years 292 days 5 years 73 days
Outstanding $ 27,330 $ 16,561
Stock options granted (in shares) 111,955  
Stock options granted (in dollars per share) $ 98.31  
Stock options granted (Year) 5 years 109 days  
Stock options forfeited (in shares) (17,924)  
Stock options forfeited (in dollars per share) $ 82.35  
Stock options forfeited (Year) 5 years 146 days  
Stock options expired (in shares) (862)  
Stock options expired (in dollars per share) $ 39.17  
Stock options expired (Year)  
Stock options exercised (in shares) (71,848)  
Stock options exercised (in dollars per share) $ 56.72  
Outstanding (in shares) 537,041 515,720
Outstanding (in dollars per share) $ 71.86 $ 64.32
Exercisable (in shares) 169,115  
Exercisable (in dollars per share) $ 47.70  
Exercisable (Year) 3 years 219 days  
Exercisable $ 12,690