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Note 6 - Stock-based Compensation - PSUs Activity (Details) - Performance Shares [Member]
12 Months Ended
Jan. 31, 2020
$ / shares
shares
Restricted stock (in shares) | shares
Restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares
Granted (in shares) | shares 93,000
Granted, weighted average grant date fair value (in dollars per share) | $ / shares $ 39.82
Released (in shares) | shares
Released, weighted average grant date fair value (in dollars per share) | $ / shares
Forfeited (in shares) | shares (3,000)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares $ 39.82
Restricted stock (in shares) | shares 90
Restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares $ 39.82