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Note 6 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 02, 2019
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
shares
Dec. 31, 2018
USD ($)
Nov. 04, 2020
USD ($)
Nov. 05, 2019
USD ($)
Capital Units, Authorized (in shares) | shares   245,000,000        
Common Stock, Shares Authorized (in shares) | shares   200,000,000 200,000,000      
Preferred Stock, Shares Authorized (in shares) | shares   20,000,000        
Common Stock, Voting Rights, Votes Per Share   1        
Dividends, Common Stock, Total | $   $ 0 $ 0 $ 0    
Treasury Stock, Value, Acquired, Cost Method | $   75,000 $ 32,000 $ 19,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $   $ 204,000        
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares   4,006,948 6,130,944      
Repurchase Authorization 2019 [Member]            
Stock Repurchase Program, Authorized Amount | $           $ 150,000
Treasury Stock, Shares, Acquired (in shares) | shares   3,688,022        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares   $ 13.81        
Treasury Stock, Value, Acquired, Cost Method | $   $ 51,000        
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $   $ 68,000        
Issuers Repurchase Program 2019 [Member]            
Treasury Stock, Shares, Acquired (in shares) | shares   905,836        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares   $ 11.02        
Treasury Stock, Value, Acquired, Cost Method | $   $ 10,000        
Repurchase Authorization 2020 [Member]            
Treasury Stock, Shares, Acquired (in shares) | shares   864,026        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares   $ 16.47        
Treasury Stock, Value, Acquired, Cost Method | $   $ 14,000        
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $   $ 136,000        
Stock Repurchase Program, Additional Authorized Amount | $         $ 150,000  
Raycom [Member] | Common Stock [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in shares) | shares 11,500,000          
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 14.74          
Common Class A [Member]            
Common Stock, Shares Authorized (in shares) | shares   25,000,000 25,000,000      
Common Stock, Voting Rights, Votes Per Share   10        
Common Stock, Capital Shares Reserved for Future Issuance (in shares) | shares   1,336,440 1,503,254