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Note 3 - Stock-based Compensation (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 08, 2019
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 750,000        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant   477,245      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   2,300,000      
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year   200,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross   0 0 0  
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total   $ 100 $ 100 $ 300  
Payment, Tax Withholding, Share-based Payment Arrangement   $ 1,110 $ 242 $ 785  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance   787,000 675,000 587,000 265,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition   1 year 240 days      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, 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   250,112      
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance   537,348      
Performance Shares [Member] | Share-based Payment Arrangement, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance   534,086      
Performance Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance   3,262      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 100      
Restricted Stock [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   3,300      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   $ 3,400 $ 700 $ 2,400  
Common Class A [Member]          
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation   62,255 11,052 31,297  
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased   $ 17.75 $ 21.89 $ 25.09  
Payment, Tax Withholding, Share-based Payment Arrangement   $ 1,100 $ 200 $ 800  
Salaries Wages And Related Expenses [Member]          
Share-based Payment Arrangement, Expense   400 4,800 1,000  
General Supplies and Expenses [Member]          
Share-based Payment Arrangement, Expense   $ 400 $ 400 $ 300