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Note 5 - Summary of Unvested Options (Details)
 3 Months Ended
Jun. 30, 2016
$ / shares
shares
Unvested (in shares) | shares 358,263
Unvested (in dollars per share) | $ / shares $ 19.46
Stock options granted (in shares) | shares 109,740
Stock options granted (in dollars per share) | $ / shares $ 27.77
Stock options forfeited (in shares) | shares (2,398)
Stock options forfeited (in dollars per share) | $ / shares $ 21.72
Stock options vested (in shares) | shares (77,355)
Stock options vested (in dollars per share) | $ / shares $ 17.01
Unvested (in shares) | shares 388,250
Unvested (in dollars per share) | $ / shares $ 22.29