Note 13 - Stockholders' Equity - Stock Options and SARs Outstanding by Exercise Price Range (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2019 $ / shares shares
Outstanding, remaining contractual life (Year)	4 years 14 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 3.84
Exercisable (in shares) | shares	604
Exercisable, remaining contractual life (Year)	3 years 361 days
Exercisable, weighted average exercise price (in dollars per share)	$ 9.75
Outstanding (in shares) | shares	1,735
Restricted Stock Units (RSUs) [Member]
Range of exercise price, lower limit (in dollars per share)	$ 0
Range of exercise price, upper limit (in dollars per share)	$ 0
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number, Ending Balance | shares	1,059
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	75
Outstanding, remaining contractual life (Year)	2 years 200 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 5.74
Exercisable (in shares) | shares	75
Exercisable, remaining contractual life (Year)	2 years 200 days
Exercisable, weighted average exercise price (in dollars per share)	$ 5.74
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	225
Outstanding, remaining contractual life (Year)	3 years 175 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 8.89
Exercisable (in shares) | shares	225
Exercisable, remaining contractual life (Year)	3 years 175 days
Exercisable, weighted average exercise price (in dollars per share)	$ 8.89
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	376
Outstanding, remaining contractual life (Year)	4 years 248 days	[1]
Outstanding, weighted average exercise price (in dollars per share)	$ 11.27
Exercisable (in shares) | shares	304
Exercisable, remaining contractual life (Year)	4 years 266 days
Exercisable, weighted average exercise price (in dollars per share)	$ 11.37

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