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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, 2015
USD ($)
days
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
shares
Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | shares 1,435,232    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Outstanding, Beginning of Period, Number of Shares | shares 3,029,348    
Outstanding, Beginning of Period, Weighted Average Exercise Price Per Share $ 5.46    
Granted, Number of Shares | shares 212,230 289,500 279,650
Granted, Weighted Average Exercise Price Per Share $ 18.42    
Exercised, Number of Shares | shares (496,496)    
Exercised, Weighted Average Exercise Price Per Share $ 2.59    
Forfeited, Number of Shares | shares (52,625)    
Forfeited, Weighted Average Exercise Price Per Share $ 8.89    
Expired, Number of Shares | shares 0    
Expired, Weighted Average Exercise Price Per Share $ 0.00    
Outstanding, End of Period, Number of Shares | shares 2,692,457 3,029,348  
Outstanding, End of Period, Weighted Average Exercise Price Per Share $ 6.94 $ 5.46  
Exercisable, Number of Shares | shares 1,435,232    
Exercisable, Weighted Average Exercise Price Per Share $ 4.44    
Available for grant | shares 2,803,988    
Weighted average fair value per share of stock options granted $ 14.68 $ 12.18 $ 10.95
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options | $ $ 1,280 $ 260 $ 60
Employee Service Share-based Compensation, Tax Benefit Realized from Exercise of Stock Options | $ 2,500 70 60
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | $ 7,150 190 170
Total intrinsic value of options outstanding | $ 19,100 $ 34,100 $ 27,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest [Abstract]      
Fair value of options vested during the year | $ 3,400    
Aggregate intrinsic value (excess market price over exercise price) | $ $ 12,900    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Weighted Average Remaining Contractual Term 4 years 1 month 21 days    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate [1] 2.32% 2.57% 1.96%
Volatility [2] 93.70% 94.26% 94.63%
Dividend yield 0.05% 0.07% 0.07%
Number of Consecutive Trading Days For Current Year Options Granted Vesting Requirement | days 10    
Share-based Compensation Arrangements, Windfall Tax Benefit, Threshold Amount | $ $ 20,200    
Equity Compensation Plan, 2014 [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Available for grant | shares 2,803,988    
Maximum [Member] | Derived Service Period [Member] | Equity Compensation Plan, 2008 [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years)   3 years 350 days 4 years
Maximum [Member] | Derived Service Period [Member] | Equity Compensation Plan, 2014 [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years) 4 years    
Minimum [Member] | Derived Service Period [Member] | Equity Compensation Plan, 2008 [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years)   2 years 360 days 3 years 9 days
Minimum [Member] | Derived Service Period [Member] | Equity Compensation Plan, 2014 [Member] | Stock Options [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Expected life (years) 3 years 9 days    
2014 Award Year [Member] | Minimum [Member] | Stock Options [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, Options Granted in Period, Closing Price of Common Stock Vesting Criteria $ 23.03    
Share-based Compensation Arrangement by Share-based Payment Award, Options Granted in Period, Percent of Increase Over Granted Price for Additional Vesting Criteria 125.00%    
2013 Award Year [Member] | Minimum [Member] | Stock Options [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, Options Granted in Period, Closing Price of Common Stock Vesting Criteria   $ 19.30  
Share-based Compensation Arrangement by Share-based Payment Award, Options Granted in Period, Percent of Increase Over Granted Price for Additional Vesting Criteria   125.00%  
2012 Award Year [Member] | Minimum [Member] | Stock Options [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, Options Granted in Period, Closing Price of Common Stock Vesting Criteria     $ 17.49
Share-based Compensation Arrangement by Share-based Payment Award, Options Granted in Period, Percent of Increase Over Granted Price for Additional Vesting Criteria     125.00%
[1] The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant.
[2] Volatility is determined at the date of grant using historical share price volatility and expected life of each award.