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Summary of Significant Accounting Policies (Narrative) (Details)
 9 Months Ended
Sep. 30, 2025
USD ($)
item
segment
Dec. 31, 2024
USD ($)
Summary of Significant Accounting Policies    
Number of market serving | item 28  
Number of FM radio stations | item 82  
Number of AM radio stations | item 3  
Number of metro signals | item 79  
Securities at amortized cost $ 9,200,000 $ 8,900,000
Securities at fair value 9,200,000 8,900,000
Allowance for credit losses $ 1,060,000 1,071,000
Number of Radio Markets | item 28  
Number of operating segments | segment 1  
Number of reportable segments | segment 1  
Assets held for sale $ 4,381,000 0
Liabilities held for sale 840,000 $ 0
Property, plant and equipment net 3,400,000  
Right of use assets 900,000  
Other assets $ 71,000