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Note 6 - Stock-based Compensation - Summary of Unvested Options (Details)
 6 Months Ended
Sep. 30, 2017
$ / shares
shares
Unvested (in shares) | shares 373,766
Unvested (in dollars per share) | $ / shares $ 22.49
Stock options granted (in shares) | shares 95,605
Stock options granted (in dollars per share) | $ / shares $ 39
Stock options forfeited (in shares) | shares (40,661)
Stock options forfeited (in dollars per share) | $ / shares $ 26.84
Stock options vested (in shares) | shares (76,835)
Stock options vested (in dollars per share) | $ / shares $ 20.93
Unvested (in shares) | shares 351,875
Unvested (in dollars per share) | $ / shares $ 28.41