Note 10 - Stock-based Compensation - Options/SARs Activity (Details) - Options/SARs [Member] $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2017 USD ($) $ / shares shares
Outstanding (in shares) | shares	2,793
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 15.51
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	$ 9.79
Outstanding, weighted average exercise price (in dollars per share) | $ / shares	$ 15.54
Outstanding at April 30, 2017 (Year)	4 years 73 days
Outstanding at April 30, 2017 | $	$ 38,958
Vested and exercisable (in shares) | shares	1,786
Vested and exercisable, weighted average exercise price (in dollars per share) | $ / shares	$ 12.96
Vested and exercisable, weighted average remaining contractual term (Year)	3 years 36 days
Vested and exercisable, aggregate intrinsic value | $	$ 29,730
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	2,776