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Note 9 - Stock-based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Note 9 - Stock-based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense $ 900,000 $ 600,000 $ 3,600,000 $ 3,100,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 300,000 200,000 $ 1,400,000 $ 1,200,000
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) 783,230   783,230  
Phantom Stock Plan [Member]        
Note 9 - Stock-based Compensation (Details) [Line Items]        
Allocated Share-based Compensation Expense $ 85,000 (25,000) $ 94,000 17,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 1,000 $ 7,000 $ 9,000 $ 13,000
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) 3,600 0 318,120 264,095
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 $ 6,700,000   $ 6,700,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 6 months  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 800,000 $ 0    
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