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Note 4 - Stock-based Compensation (Details Textual) - USD ($)
12 Months Ended
Jul. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
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)   1,152,479      
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   $ 1,332,000 $ 297,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)   0      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   562,000 645,000   787,000
Services Provided [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)   307,967      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Month)   14 months 6 days      
Performance Shares [Member]          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance (in shares)     253,672    
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   $ 2,500,000      
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    
Restricted Stock [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   2,700,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value   4,900,000 $ 900,000    
Share-based Payment Arrangement, Option [Member]          
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total   6,700,000      
Common Class A [Member]          
Payment, Tax Withholding, Share-based Payment Arrangement   $ 500,000 $ 300,000    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   60,752 20,570    
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)   $ 21.87 $ 14.65    
Minimum [Member]          
Payment, Tax Withholding, Share-based Payment Arrangement   $ 2,400,000      
Maximum [Member]          
Payment, Tax Withholding, Share-based Payment Arrangement     $ 100,000    
Salaries Wages And Related Expenses [Member]          
Share-based Payment Arrangement, Expense   5,000,000.0 1,800,000    
General Supplies and Expenses [Member]          
Share-based Payment Arrangement, Expense     400,000    
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net, Total   $ 300,000 $ 200,000