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Note 5 - Stock-Based Compensation - Summary of Unvested Options (Details)
 9 Months Ended
Dec. 31, 2015
$ / shares
shares
Unvested (in shares) | shares 274,038
Unvested (in dollars per share) | $ / shares $ 18.42
Stock options granted (in shares) | shares 183,550
Stock options granted (in dollars per share) | $ / shares $ 18.77
Stock options forfeited (in shares) | shares (12,384)
Stock options forfeited (in dollars per share) | $ / shares $ 19.53
Stock options vested (in shares) | shares (83,542)
Stock options vested (in dollars per share) | $ / shares $ 14.56
Unvested (in shares) | shares 361,662
Unvested (in dollars per share) | $ / shares $ 19.43