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Note 5 - Stock-Based Compensation - Summary of Unvested Options (Details)
shares in Thousands
 6 Months Ended
Sep. 30, 2015
$ / shares
shares
Unvested at March 31, 2015 (in shares) | shares 274,038
Unvested at March 31, 2015 (in dollars per share) $ 18.42
Stock options granted (in shares) | shares 180,050
Stock options granted (in dollars per share) $ 18.50
Stock options forfeited (in shares) | shares (11,989)
Stock options forfeited (in dollars per share) $ 19.63
Stock options vested (in shares) | shares (76,428)
Stock options vested (in dollars per share) $ 14.56
Unvested at September 30, 2015 (in shares) | shares 365,671
Unvested at September 30, 2015 (in dollars per share) $ 19.23