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Note 5 - Stock-Based Compensation - Summary of Option Activity (Details) - USD ($)
shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2015
Mar. 31, 2015
Number of Shares (in shares) 555,487 437,248
Weighted-Average Exercise Price per Share (in dollars per share) $ 62.20 $ 55.81
Weighted-Average Remaining Contractual Term 5 years 182 days 4 years 328 days
Aggregate Intrinsice Value $ 27,330 $ 9,445
Stock options granted (in shares) 180,050  
Stock options granted (in dollars per share) $ 72.18  
Stock options granted 7 years 109 days  
Stock options forfeited (in shares) (11,989)  
Stock options forfeited (in dollars per share) $ 77.29  
Stock options forfeited 7 years 219 days  
Stock options exercised (in shares) (49,822)  
Stock options exercised (in dollars per share) $ 38.56  
Exercisable at September 30, 2015 (in shares) 189,816  
Exercisable at September 30, 2015 (in dollars per share) $ 40.93  
Exercisable at September 30, 2015 3 years 255 days  
Exercisable at September 30, 2015 $ 13,376