Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2022 USD ($) item shares	Sep. 30, 2021 shares	Sep. 30, 2022 USD ($) item segment $ / shares	Dec. 31, 2021 USD ($)
Summary of Significant Accounting Policies
Number Of Market Serving | item	27		27
Number Of FM Radio Stations | item			79
Number Of AM Radio Stations			35
Number Of Metro Signals			80
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	0	0
Common Stock, Dividends, Per Share, Cash Paid | $ / shares			$ 0
Debt securities, held to maturity	$ 10,100,000		$ 10,100,000
Debt securities, held to maturity, fair value	10,000,000		10,000,000
Marketable securities, current				$ 0
Allowance for doubtful accounts receivable	$ 392,000		$ 392,000	$ 469,000
Number of Radio Markets | item			27
Number of operating segments | segment			1
Number of reportable segments | segment			1