Note 12 - Stock-based Compensation - Options/SARs Activity (Details) - Options/SARs [Member] $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 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	(5)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 10.78
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	2,528
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 20.83
Outstanding, weighed average remaining contractual term (Year)	3 years 109 days
Outstanding, aggregate intrinsic value | $	$ 63,211
Vested and exercisable (in shares) | shares	2,053	[1]
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 17.06
Vested and exercisable, weighed average remaining contractual term (Year)	2 years 219 days
Vested and exercisable, aggregate intrinsic value | $	$ 57,650

[1] The number of SARs vested and exercisable at April 30, 2019 includes 877,500 Class A and 127,500 Class B shares previously held by Mr. Karl Lopker which will expire on August 25, 2019 if not exercised by his estate. Exercise prices for these SARs range from $10.50 to $31.65.