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Note 15 - Share-Based and Other Compensation Plans (Non-Qualified Stock Options) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
days
$ / shares
shares
Dec. 31, 2015
USD ($)
days
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Number of Consecutive Trading Days For Current Year Options Granted Vesting Requirement | days   10  
Restricted Stock Units (RSUs) Equity Settled [Member] | Share-based Compensation Award, Tranche One [Member] | 2016 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%  
Restricted Stock Units (RSUs) Equity Settled [Member] | Share-based Compensation Award, Tranche Two [Member] | 2016 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage   50.00%  
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Beginning of Period, Number of Shares | shares 2,839,738 2,692,457  
Outstanding, Beginning of Period, Weighted Average Exercise Price Per Share $ 7.64    
Granted, Number of Shares | shares 0 342,090 212,230
Granted, Weighted Average Exercise Price Per Share $ 0.00    
Exercised, Number of Shares | shares (1,092,559)    
Exercised, Weighted Average Exercise Price Per Share $ 6.53    
Forfeited, Number of Shares | shares (54,436)    
Forfeited, Weighted Average Exercise Price Per Share $ 13.79    
Expired, Number of Shares | shares 0    
Expired, Weighted Average Exercise Price Per Share $ 0.00    
Outstanding, End of Period, Number of Shares | shares 1,692,743 2,839,738 2,692,457
Outstanding, End of Period, Weighted Average Exercise Price Per Share $ 8.16 $ 7.64  
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 7 months    
Total intrinsic value of options outstanding | $ $ 21,075    
Exercisable, Number of Shares | shares 1,162,943    
Exercisable, Weighted Average Exercise Price Per Share $ 5.24    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 4 years 7 months    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value | $ $ 17,878    
Available for grant | shares 8,851,531    
Weighted average fair value per share of stock options granted [1] $ 0.00 $ 9.72 $ 14.68
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ $ 14,389 $ 1,519 $ 7,146
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options (Deprecated 2017-01-31) | $ 5,036 532 2,501
Proceeds from Stock Options Exercised | $ $ 7,131 $ 717 $ 1,285
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years) 4 years    
Risk-free interest rate [2]   1.72% 2.32%
Volatility [3]   94.20% 93.70%
Dividend yield   0.08% 0.05%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value | $ $ 3,300    
Number of Consecutive Trading Days For Current Year Options Granted Vesting Requirement | days     10
Stock Options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years)   3 years 9 days 3 years 9 days
Stock Options [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years)   4 years 4 years
Stock Options [Member] | 2016 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Granted in Period, Percent of Increase Over Granted Price for Additional Vesting Criteria   125.00%  
Stock Options [Member] | 2016 Award Year [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Granted in Period, Closing Price of Common Stock Vesting Criteria   $ 15.20  
Stock Options [Member] | 2015 Award Year [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Granted in Period, Percent of Increase Over Granted Price for Additional Vesting Criteria     125.00%
Stock Options [Member] | 2015 Award Year [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Shares Granted in Period, Closing Price of Common Stock Vesting Criteria     $ 23.03
Stock Options [Member] | Share-based Compensation Award, Tranche One [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
Stock Options [Member] | Share-based Compensation Award, Tranche Two [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 50.00%    
[1] We use the Monte Carlo valuation model in determining the grant date fair value of stock options issued to executives and non-executives using the assumptions noted in the following table: Year Ended December 31, 2016 2015Derived service period (years)3.02 - 4.00 3.02 - 4.00Risk-free interest rate (a) 1.72% 2.32%Volatility (b) 94.20% 93.70%Dividend yield0.08% 0.05%______________________(a)The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant.(b)Volatility is determined at the date of grant using historical share price volatility and expected life of each award.
[2] The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant.
[3] Volatility is determined at the date of grant using historical share price volatility and expected life of each award.