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Note 9 - Stock-based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Note 9 - Stock-based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense $ 500,000 $ 500,000 $ 3,600,000 $ 4,200,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 200,000 200,000 $ 1,600,000 $ 1,400,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares)     318,120  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in Shares)     0 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value     $ 4,900,000 $ 4,100,000
Twenty Fourteen Omnibus Incentive Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in Shares) 1,100,000   1,100,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in Shares) 784,830   784,830  
Phantom Stock Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense $ 65,000 25,000 $ 29,000 17,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 0 $ 21,000 $ 9,000 $ 34,000
Phantom Stock Plan [Member] | Officer [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     100 years  
Annually [Member] | Phantom Stock Plan [Member] | Officer [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     20.00%  
Vested Upon Change in Control [Member] | Phantom Stock Plan [Member] | Officer [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage     100.00%  
Restricted Stock Units (RSUs) [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in Shares) 0 2,800 318,120 266,895
Restricted Stock Units (RSUs) [Member] | Twenty Fourteen Omnibus Incentive Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 6,100,000   $ 6,100,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 109 days  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 39,000 $ 4,000    
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year  
Minimum [Member] | Twenty Fourteen Omnibus Incentive Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     3 years  
Maximum [Member] | Twenty Fourteen Omnibus Incentive Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period     10 years