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Note 5 - Stock-Based Compensation (Details) - Summary of Option Activity (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2014
Summary of Option Activity [Abstract]    
Outstanding Number of Shares 516,990 398,172
Outstanding Weighted-Avg. Exercise Price $ 52.39 $ 38.75
Outstanding Weighted-Avg. Remaining Contractual Term 5 years 73 days 4 years 146 days
Outstanding Aggregate Intrinsic Value $ 17,046 $ 20,505
Exercisable at June 30, 2014 221,035  
Exercisable at June 30, 2014 $ 30.76  
Exercisable at June 30, 2014 3 years 6 months  
Exercisable at June 30, 2014 $ 11,759  
Stock options granted 141,900  
Stock options granted $ 89.59  
Stock options granted 7 years 292 days  
Stock options forfeited (7,279)  
Stock options forfeited $ 58.08  
Stock options exercised (15,803)  
Stock options exercised $ 35.55