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, 2019 USD ($) $ / shares shares
Outstanding (in shares) | shares	2,533
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 20.81
Granted (in shares) | shares
Granted, weighted average exercise price (in dollars per share) | $ / shares
Exercised (in shares) | shares	(17)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 11.44
Expired (in shares) | shares
Expired, weighted average exercise price (in dollars per share) | $ / shares
Forfeited (in shares) | shares
Forfeited, weighted average exercise price (in dollars per share) | $ / shares
Outstanding (in shares) | shares	2,516
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 20.87
Outstanding, weighted average remaining contractual term (Year)	3 years
Outstanding, aggregate intrinsic value | $	$ 55,181
Vested and exercisable at July 31, 2019 (in shares) | shares	2,231	[1]
Vested and exercisable at July 31, 2019 (in dollars per share) | $ / shares	$ 18.38
Vested and exercisable at July 31, 2019 (Year)	2 years 219 days
Vested and exercisable at July 31, 2019 | $	$ 53,002

[1] The number of SARs vested and exercisable at July 31, 2019 includes 877,500 Class A and 127,500 Class B shares previously held by Mr. Karl Lopker which were exercised on August 22, 2019 by his estate, prior to their expiration date of August 25, 2019. Exercise prices for these SARs range from $10.50 to $31.65.