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Note 5 - Stock-based Compensation - Summary of Unvested Options (Details)
 9 Months Ended
Dec. 31, 2016
$ / shares
shares
Unvested (in shares) | shares 358,263
Unvested (in dollars per share) | $ / shares $ 19.46
Stock options granted (in shares) | shares 111,955
Stock options granted (in dollars per share) | $ / shares $ 27.94
Stock options forfeited (in shares) | shares (17,924)
Stock options forfeited (in dollars per share) | $ / shares $ 22.17
Stock options vested (in shares) | shares (84,368)
Stock options vested (in dollars per share) | $ / shares $ 16.95
Unvested (in shares) | shares 367,926
Unvested (in dollars per share) | $ / shares $ 22.49