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Note 11 - Related Party Transactions (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Aug. 26, 2016
Sep. 30, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Operating Lease, Right-of-Use Asset     $ 26,356,000   $ 26,356,000   $ 28,116,000
Affiliated Entity [Member]              
Operating Lease, Expense     700,000 $ 700,000 1,400,000 $ 1,400,000  
Operating Lease, Right-of-Use Asset     2,700,000   2,700,000    
Operating Lease, Liability, Total     3,900,000   $ 3,900,000    
Affiliated Entity [Member] | Mosing Holdings [Member]              
Percentage of Tax Benefits Realized Payable Under Tax Receivable Agreement 85.00%            
Percentage of Tax Benefits Retained Under Tax Receivable Agreement 15.00%            
Cumulative Earnings (Deficit), Period (Month)         36 months    
Tax Receivable Agreement, Liability, Estimated Termination Payment     $ 66,500,000   $ 66,500,000    
Tax Receivable Agreement, Liability, Discount Rate     5.00%   5.00%    
Affiliated Entity [Member] | Mosing Holdings [Member] | Forecast [Member]              
Tax Receivable Agreement, Cash Payment for Settlement of Early Termination Payment Obligation   $ 15,000,000          
Tax Receivable Agreement, Condition of Early Termination Payment Obligation Settlement, Period Over Which Future Contingent Payments May Be Made (Year)   10 years          
Tax Receivable Agreement, Condition of Early Termination Payment Obligation Settlement, Future Contingent Payments, Cash Tax Savings Threshold   $ 18,057,000          
Affiliated Entity [Member] | Mosing Holdings [Member] | Long-term Treasury Rate [Member]              
Tax Receivable Agreement, Basis Spread on Variable Rate 3.00%