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Note 3 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Feb. 21, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,550,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 50,960        
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year 200,000        
Allocated Share-based Compensation Expense, Total $ 4,800 $ 1,000 $ 1,200    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 0 0 0    
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation $ 100 $ 300 $ 200    
Payments Related to Tax Withholding for Share-based Compensation $ 242 $ 785 $ 1,142    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 675,000 587,000 265,000 330,000  
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 5,900        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 700 $ 2,400 $ 3,500    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 120 days        
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options, Ending Balance 0 0 0    
Services Provided [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 242,862        
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 432,575        
Performance Shares [Member] | Related to Performance for Year Ended December 31, 2018 [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 123,744        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 0        
Performance Shares [Member] | Related to Performance for Year Ended December 31, 2018 [Member] | Share-based Compensation Award, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 85,326        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 0        
Performance Shares [Member] | Related Performance for Year Ended December 31, 2019 Through December 31, 2022 [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance 223,505        
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Total $ 2,300        
Common Class A [Member]          
Shares Paid for Tax Withholding for Share Based Compensation 11,052 31,297 55,429    
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased $ 21.89 $ 25.09 $ 20.61    
Payments Related to Tax Withholding for Share-based Compensation $ 200 $ 800 $ 1,100    
General Supplies and Expenses [Member]          
Allocated Share-based Compensation Expense, Total $ 400 $ 300 $ 200    
Third Amendment [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         750,000
Second Amendment [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         800,000