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Note 11 - Stock-based Compensation - RSUs Activity (Details) - Restricted Stock Units (RSUs) [Member]
shares in Thousands
6 Months Ended
Jul. 31, 2018
$ / shares
shares
Restricted stock (in shares) | shares 653
Restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares $ 25.10
Granted (in shares) | shares 270
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 52.72
Released (in shares) | shares (252) [1]
Released, weighted average grant date fair value (in dollars per share) | $ / shares $ 25.56 [1]
Forfeited (in shares) | shares (13)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 25.13
Restricted stock (in shares) | shares 658
Restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares $ 36.22
[1] The number of RSUs released includes shares withheld on behalf of employees to satisfy the minimum statutory tax withholding requirements.