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Note 5 - Stockholders' Equity (Details Textual)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jan. 02, 2019
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
Jun. 30, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
shares
Nov. 05, 2019
USD ($)
Capital Units, Authorized (in shares)   245,000,000   245,000,000    
Common Stock, Shares Authorized (in shares)   200,000,000   200,000,000 200,000,000  
Preferred Stock, Shares Authorized (in shares)   20,000,000   20,000,000    
Common Stock, Voting Rights, Votes Per Share   1   1    
Dividends, Common Stock, Total | $       $ 0    
Treasury Stock, Value, Acquired, Cost Method | $   $ 43,000 $ 6,000      
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   4,809,164   4,809,164    
Repurchase Authorization 2019 [Member]            
Stock Repurchase Program, Authorized Amount | $           $ 150,000
Treasury Stock, Shares, Acquired (in shares)   2,930,342        
Treasury Stock Acquired, Average Cost Per Share (in dollars per share) | $ / shares   $ 13.33        
Treasury Stock, Value, Acquired, Cost Method | $   $ 39,000        
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $   $ 80,000   $ 80,000    
Issuers Repurchase Program 2019 [Member]            
Treasury Stock, Shares, Acquired (in 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    
Raycom [Member] | Common Stock [Member]            
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in 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)   25,000,000   25,000,000 25,000,000  
Common Stock, Voting Rights, Votes Per Share   10   10    
Common Stock, Capital Shares Reserved for Future Issuance (in shares)   1,336,440   1,336,440