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Summary of Significant Accounting Policies (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
item
shares
Sep. 30, 2020
shares
Sep. 30, 2021
USD ($)
item
segment
shares
Sep. 30, 2020
shares
Dec. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number Of FM Radio Stations | item     79    
Number Of AM Radio Stations     34    
Number Of Metro Signals     79    
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares 0 0 0 0  
Number of reportable segments | segment     1    
Number Of Market Serving | item 27   27    
Operating Lease, Right-of-Use Asset | $ $ 5,500,000   $ 5,500,000   $ 6,600,000
Number of operating segments | segment     1    
Operating Lease, Liability | $ 5,841,000   $ 5,841,000   6,900,000
Allowance for doubtful accounts receivable | $ $ 385,000   $ 385,000   $ 648,000
Number of Radio Markets | item     27    
Customer relationships [Member]          
Summary Of Significant Accounting Policies [Line Items]          
Finite-Lived Intangible Asset, Useful Life     3 years