Note 12 - Stockholders' Equity - Stock Options and SARs Outstanding by Exercise Price Range (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2017 $ / shares shares
Outstanding, remaining contractual life (Year)	4 years 153 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 5.02
Exercisable (in shares) | shares	813
Exercisable, remaining contractual life (Year)	3 years 262 days
Exercisable, weighted average exercise price (in dollars per share)	$ 8.20
Outstanding (in shares) | shares	1,992
Restricted Stock Units (RSUs) [Member]
Range of exercise price, lower limit (in dollars per share)	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number | shares	872
Options and SARs [Member] | Range 1 [Member]
Range of exercise price, lower limit (in dollars per share)	$ 5.21
Range of exercise price, upper limit (in dollars per share)	$ 7.26
Outstanding (in shares) | shares	231
Outstanding, remaining contractual life (Year)	3 years 10 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 5.89
Exercisable (in shares) | shares	231
Exercisable, remaining contractual life (Year)	3 years 10 days
Exercisable, weighted average exercise price (in dollars per share)	$ 5.89
Options and SARs [Member] | Range 2 [Member]
Range of exercise price, lower limit (in dollars per share)	7.49
Range of exercise price, upper limit (in dollars per share)	$ 9.71
Outstanding (in shares) | shares	458
Outstanding, remaining contractual life (Year)	3 years 248 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 8.50
Exercisable (in shares) | shares	451
Exercisable, remaining contractual life (Year)	3 years 248 days
Exercisable, weighted average exercise price (in dollars per share)	$ 8.50
Options and SARs [Member] | Range 3 [Member]
Range of exercise price, lower limit (in dollars per share)	10.15
Range of exercise price, upper limit (in dollars per share)	$ 15.79
Outstanding (in shares) | shares	431
Outstanding, remaining contractual life (Year)	5 years 346 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 11.01
Exercisable (in shares) | shares	131
Exercisable, remaining contractual life (Year)	5 years 10 days
Exercisable, weighted average exercise price (in dollars per share)	$ 11.22

[1] Calculation of weighted average remaining contractual term does not include the RSUs that were granted, which have an indefinite contractual term.