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Summary of Significant Accounting Policies (Narrative) (Details)
12 Months Ended
Dec. 31, 2024
USD ($)
segment
item
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Mar. 31, 2013
USD ($)
Summary Of Significant Accounting Policies      
Number of FM radio stations 82    
Number of AM radio stations 31    
Number of market serving | item 28    
Time deposits $ 0 $ 0  
Securities at amortized cost 8,900,000 10,600,000  
Securities at fair value $ 8,900,000 10,600,000  
Number Of Broad cast Licenses | item 113    
Weighted-average period of FCC license 4 years 1 month 6 days    
Write-off of debt issuance costs $ 36,000 36,000  
Net book value of deferred costs $ 94,000 $ 130,000  
Treasury stock shares acquired | shares 21,865 11,274  
Treasury stock acquired, average cost per share | $ / shares $ 13.28 $ 20.12  
Number of operating segments | segment 1    
Number of reportable segments | segment 1    
Number of metro signals | item 79    
Customer relationships      
Summary Of Significant Accounting Policies      
Useful life 3 years    
Class A Common Stock      
Summary Of Significant Accounting Policies      
Stock repurchase program, remaining authorization amount $ 17,700,000    
Continuing Operations      
Summary Of Significant Accounting Policies      
Advertising and promotion costs $ 1,595,000 $ 1,705,000  
Top five markets | Revenue benchmark | Revenue from rights concentration risk      
Summary Of Significant Accounting Policies      
Concentration risk, market risk 36.00% 37.00%  
Minimum | Favorable lease agreements      
Summary Of Significant Accounting Policies      
Useful life 1 year    
Minimum | Other intangibles      
Summary Of Significant Accounting Policies      
Useful life 1 year    
Minimum | Class A Common Stock      
Summary Of Significant Accounting Policies      
Share repurchase program, authorized amount     $ 60,000,000
Maximum | Favorable lease agreements      
Summary Of Significant Accounting Policies      
Useful life 26 years    
Maximum | Other intangibles      
Summary Of Significant Accounting Policies      
Useful life 15 years    
Maximum | Class A Common Stock      
Summary Of Significant Accounting Policies      
Share repurchase program, authorized amount     $ 75,800,000