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Note 5 - Stock-Based Compensation - Summary of Option Activity (Details)
$ in Thousands
 9 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 437,248
Weighted-Average Exercise Price per Share (in dollars per share) | $ / shares $ 55.81
Weighted-Average Remaining Contractual Term 4 years 328 days
Aggregate Intrinsice Value | $ $ 9,445
Stock options granted (in shares) | shares 183,550
Stock options granted (in dollars per share) | $ / shares $ 72.87
Stock options granted 6 years 328 days
Stock options forfeited (in shares) | shares (12,384)
Stock options forfeited (in dollars per share) | $ / shares $ 76.89
Stock options forfeited 7 years 73 days
Stock options exercised (in shares) | shares (72,803)
Stock options exercised (in dollars per share) | $ / shares $ 39.98
Outstanding (in shares) | shares 535,611
Weighted-Average Exercise Price per Share (in dollars per share) | $ / shares $ 63.32
Aggregate Intrinsice Value | $ $ 19,412
Exercisable (in shares) | shares 173,949
Weighted-Average Exercise Price per Share, Exercisable (in dollars per share) | $ / shares $ 41.40
Weighted-Average Remaining Contractual Term, Exercisable 3 years 219 days
Aggregate Intrinsice Value, Exercisable | $ $ 10,107