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Note 11 - Stock-based Compensation - PSUs Activity (Details) - Performance Shares [Member]
shares in Thousands
3 Months Ended
Apr. 30, 2020
$ / shares
shares
Outstanding (in shares) | shares 90
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 39.82
Granted (in shares) | shares
Granted, weighted average exercise price (in dollars per share) | $ / shares
Released (in shares) | shares
Released, weighted average grant date fair value (in dollars per share) | $ / shares
Forfeited (in shares) | shares
Forfeited, weighted average exercise price (in dollars per share) | $ / shares
Outstanding (in shares) | shares 90
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 39.82