Note 11 - Stock-based Compensation - Options/SARs Activity (Details) - Options/SARs [Member] $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018 USD ($) $ / shares shares
Outstanding (in shares) | shares	3,024
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 17.78
Granted (in shares) | shares
Granted, weighted average exercise price (in dollars per share) | $ / shares
Exercised (in shares) | shares	(339)
Exercised, weighted average exercise price (in dollars per share) | $ / shares	$ 9.25
Expired (in shares) | shares
Expired, weighted average exercise price (in dollars per share) | $ / shares
Forfeited (in shares) | shares	(1)
Forfeited, weighted average exercise price (in dollars per share) | $ / shares	$ 19.40
Outstanding (in shares) | shares	2,684
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 18.86
Outstanding at April 30, 2018 (Year)	4 years 73 days
Outstanding at April 30, 2018 | $	$ 66,381
Vested and exercisable (in shares) | shares	1,734
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 15.24
Vested and exercisable, weighted average remaining contractual term (Year)	3 years 36 days
Vested and exercisable, aggregate intrinsic value | $	$ 48,961