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Note 12 - Stock-based Compensation - PSUs Activity (Details) - Performance Shares [Member]
shares in Thousands
3 Months Ended
Apr. 30, 2021
$ / shares
shares
Outstanding (in shares) | shares 153
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 40.26
Granted (in shares) | shares 0
Granted, weighted average exercise price (in dollars per share) | $ / shares $ 0
Released (in shares) | shares 0
Released, weighted average grant date fair value (in dollars per share) | $ / shares $ 0
Forfeited (in shares) | shares 0
Forfeited, weighted average exercise price (in dollars per share) | $ / shares $ 0
Outstanding (in shares) | shares 153
Outstanding, weighted average exercise price (in dollars per share) | $ / shares $ 40.26