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Note 16 - Subsequent Events (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Feb. 24, 2021
Jan. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Feb. 18, 2021
Jan. 02, 2019
Common Stock, Dividends, Per Share, Declared (in dollars per share)     $ 0 $ 0 $ 0    
Revolving Credit Facility [Member] | The 2019 Senior Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity             $ 200
Subsequent Event [Member] | Common Stock and Class A Common Stock [Member]              
Common Stock, Dividends, Per Share, Declared (in dollars per share) $ 0.08            
Dividends Payable, Date to be Paid Mar. 31, 2021            
Dividends Payable, Date of Record Mar. 15, 2021            
Subsequent Event [Member] | Revolving Credit Facility [Member] | The Amended 2019 Senior Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity           $ 300  
Quincy [Member] | Subsequent Event [Member]              
Payments to Acquire Businesses, Gross   $ 925          
Business Acquisition, Termination Option, Fee   $ 25