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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Restricted Stock Units (RSUs) [Member] | Omnibus Plan 2014 [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 4,000 $ 39,000 $ 4,800,000 $ 4,900,000
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0 337,175 318,120
Phantom Share Units (PSUs) [Member] | Phantom Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period     1 year  
Phantom Stock Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 0 $ 0 $ 28,000 $ 9,000
Allocated Share-based Compensation Expense 400,000 100,000 200,000 29,000
Omnibus Plan 2014 [Member]        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized 7,400,000   $ 7,400,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition     3 years 109 days  
Allocated Share-based Compensation Expense 1,100,000 500,000 $ 4,700,000 4,200,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense $ 400,000 $ 200,000 $ 1,800,000 $ 1,600,000