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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Jul. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2020
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized (in shares) 1,900,000          
Fungible Share Reserve Feature, Shares Subject for Each Share Granted (in shares) 1          
Fungible Share Reserve Feature, Shares Subject to All Other Awards (in shares) 1.80          
Maximum Number of Shares of Class A Common Stock Awarded to any Participant in the Incentive Plan in any Calendar Year (in shares) 500,000 500,000     200,000  
Maximum Cash Awarded to any Participant in the Incentive Plan in any Calendar Year $ 4,000,000 $ 4,000,000     $ 2,000,000  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares)   1,785,014        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   4,200,000        
Payment, Tax Withholding, Share-based Payment Arrangement   $ 297,000 $ 1,110,000 $ 242,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)     0 0    
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total   $ 200,000 $ 100,000 $ 300,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)   0 0 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   645,000 787,000 675,000   587,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)   30 months        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)     0 0    
Services Provided [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   192,472        
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   397,499        
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 (in shares)   0        
Performance Shares [Member] | Share-based Payment Arrangement, Tranche Two [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 0        
Market Based Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   55,000        
Restricted Stock [Member]            
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 1,900,000        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   900,000 $ 3,400,000 $ 700,000    
Common Class A [Member]            
Payment, Tax Withholding, Share-based Payment Arrangement   $ 300,000 $ 1,100,000 $ 800,000    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   20,570 62,255 11,052    
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)   $ 14.65 $ 17.75 $ 21.89    
Maximum [Member]            
Payment, Tax Withholding, Share-based Payment Arrangement   $ 100,000        
Salaries Wages And Related Expenses [Member]            
Share-based Payment Arrangement, Expense   1,800,000 $ 400,000 $ 4,800,000    
General Supplies and Expenses [Member]            
Share-based Payment Arrangement, Expense   $ 400,000 $ 400,000 $ 400,000