Note 12 - Stock-based Compensation - PSUs Activity (Details) - Performance Shares [Member] shares in Thousands	6 Months Ended
	Jul. 31, 2021 $ / shares shares
Restricted stock (in shares) | shares	153
Restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares	$ 40.26
Granted (in shares) | shares	69
Granted, weighted average grant date fair value (in dollars per share) | $ / shares	$ 63.10
Released (in shares) | shares	(56)	[1]
Released, weighted average grant date fair value (in dollars per share) | $ / shares	$ 40.54
Forfeited (in shares) | shares	(32)
Forfeited, weighted average grant date fair value (in dollars per share) | $ / shares	$ 39.84
Restricted stock (in shares) | shares	134
Restricted stock, weighted average grant date fair value (in dollars per share) | $ / shares	$ 52.03

[1] The number of PSUs released includes shares withheld on behalf of employees to satisfy the minimum statutory tax withholding requirements.