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Note 9 - Stock-based Compensation (Details Textual) - USD ($)
3 Months Ended
Jul. 01, 2020
Mar. 31, 2021
Mar. 31, 2020
Jun. 30, 2020
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)   1,685,323    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares)   4,200,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number (in shares)     0  
Payment, Tax Withholding, Share-based Payment Arrangement   $ 531,000 $ 6,000  
Common Class A [Member]        
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation (in shares)   27,041    
Share-based Compensation Arrangement by Share-based Payment Award, Per Share Weighted Average Price of Shares Purchased (in dollars per share)   $ 19.66    
Payment, Tax Withholding, Share-based Payment Arrangement   $ 500,000    
Restricted Stock [Member]        
Share-based Payment Arrangement, Expense   2,200,000    
Share-based Payment Arrangement, Option [Member]        
Share-based Payment Arrangement, Expense   400,000    
Salaries Wages And Related Expenses [Member]        
Share-based Payment Arrangement, Expense   $ 2,600,000 $ 500,000