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Note 3 - Acquisitions (Details Textual) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Apr. 29, 2021
Quincy Television Stations in Seven Markets [Member] | Subsequent Event [Member]        
Disposal Group, Including Discontinued Operation, Consideration       $ 380
The 2020 Acquisitions [Member]        
Payments to Acquire Businesses, Gross     $ 24  
The 2020 Acquisitions [Member] | Minimum [Member]        
Property, Plant and Equipment, Useful Life (Year)   3 years    
Finite-Lived Intangible Asset, Useful Life (Year)   1 year    
The 2020 Acquisitions [Member] | Maximum [Member]        
Property, Plant and Equipment, Useful Life (Year)   40 years    
Finite-Lived Intangible Asset, Useful Life (Year)   4 years    
Quincy [Member]        
Payments to Acquire Businesses, Gross $ 925      
Business Combination, Consideration Transferred, Total 925      
Business Acquisition, Termination Option, Fee $ 25