Note 12 - Stock-based Compensation - SARs Activity (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, shares in Thousands, $ in Thousands	6 Months Ended
	Jul. 31, 2021 USD ($) $ / shares shares
Outstanding (in shares) | shares	1,144
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 27.01
Exercised (in shares) | shares	(194)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 11.61
Outstanding (in shares) | shares	950
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 30.16
Outstanding, weighted average remaining contractual term (Year)	2 years 10 months 24 days
Outstanding, aggregate intrinsic value | $	$ 36,286
Vested and exercisable (in shares) | shares	903
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 28.93
Vested and exercisable, weighted average remaining contractual term (Year)	2 years 9 months 18 days
Vested and exercisable, aggregate intrinsic value | $	$ 35,469