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Note 1 - Basis of Presentation (Details Textual)
$ in Millions
3 Months Ended 12 Months Ended
Feb. 08, 2024
USD ($)
Mar. 31, 2024
USD ($)
Rate
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Feb. 23, 2023
USD ($)
Number of Operating Segments   2      
Number of Television Markets   114      
Percent of US Television Households Reached (Rate) | Rate   36.00%      
Number of Television Markets with Top-Rated Stations   79      
Number of Television Markets with First and/or Second Rated Stations   102      
Proceeds from Sale of Long-Term Investments   $ 110 $ 0    
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]   Secured Overnight Financing Rate (SOFR) [Member]      
Wells Fargo Bank, N.A. [Member]          
Accounts Receivable Securitization Program Maximum Capacity         $ 300
Debt Instrument, Basis Spread on Variable Rate   1.00%      
Proceeds from Accounts Receivable Securitization   $ 300   $ 300  
Accounts Receivable Securitization, Unsold Receivables   307   $ 296  
Accounts Receivable Securitization, Total Receivables   607 597    
Accounts Receivable Securitization, Charge for Discount     9    
Sale Agreement with the Doraville Community Improvement District [Member]          
Total Proceeds From Project   $ 5 $ 26    
Broadcast Music Inc. [Member]          
Proceeds from Sale of Long-Term Investments $ 110