Note 12 - Stock-based Compensation - SARs Activity (Details) - Stock Appreciation Rights (SARs) [Member] $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2021 USD ($) $ / shares shares
Outstanding (in shares) | shares	1,144
Outstanding, weighted average exercise price (in dollars per share)	$ 27.01
Exercised, weighted average exercise price (in dollars per share)	$ 0
Outstanding (in shares) | shares	1,144
Outstanding, weighted average exercise price (in dollars per share)	$ 27.01
Outstanding, weighted average remaining contractual term (Year)	2 years 7 months 6 days
Outstanding, aggregate intrinsic value | $	$ 47,013
Vested and exercisable (in shares) | shares	1,002
Vested and exercisable, weighted average exercise price (in dollars per share)	$ 24.28
Vested and exercisable, weighted average remaining contractual term (Year)	2 years 3 months 18 days
Vested and exercisable, aggregate intrinsic value | $	$ 43,525