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Note 15 - Share-Based and Other Compensation Plans (Non-Qualified Stock Options - Range of Exercise Prices) (Details) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number Outstanding 2,692,457    
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 4 years 3 months 1 day    
Options Exercisable, Number Exercisable 1,435,232    
$2.45 - $3.58 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range Limit $ 2.45    
Range of Exercise Prices, Upper Range Limit $ 3.58    
$2.45 - $3.58 [Member] | Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number Outstanding 1,718,010    
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 5 years 2 months 6 days    
Options Outstanding, Weighted Average Exercise Price $ 2.8    
Options Exercisable, Number Exercisable 1,153,515    
Options Exercisable, Weighted Average Exercise Price $ 2.98    
$5.76 - $7.06 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range Limit 5.76    
Range of Exercise Prices, Upper Range Limit $ 7.06    
$5.76 - $7.06 [Member] | Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number Outstanding 47,967    
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 2 years 2 months 6 days    
Options Outstanding, Weighted Average Exercise Price $ 6.92    
Options Exercisable, Number Exercisable 47,967    
Options Exercisable, Weighted Average Exercise Price $ 6.92    
$10.42 - $15.44 [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Range of Exercise Prices, Lower Range Limit 10.42    
Range of Exercise Prices, Upper Range Limit $ 15.44    
$10.42 - $15.44 [Member] | Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number Outstanding 718,790    
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 6 years 1 month 10 days    
Options Outstanding, Weighted Average Exercise Price $ 13.53    
Options Exercisable, Number Exercisable 225,580    
Options Exercisable, Weighted Average Exercise Price $ 10.91    
Equity Compensation Plan, 1995 and 2008 [Member] | Exercise Price Range, Four [Member] | Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
Options Outstanding, Number Outstanding 207,690    
Options Outstanding, Weighted Average Remaining Contractual Life (Years) 3 years 7 days    
Options Outstanding, Weighted Average Exercise Price $ 18.42    
Options Exercisable, Number Exercisable 8,170    
Options Exercisable, Weighted Average Exercise Price $ 18.42    
2013 Award Year [Member] | Minimum [Member] | Stock Options [Member]      
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
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, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]      
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%