Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended
	Mar. 31, 2024 USD ($) item segment $ / shares shares	Mar. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of market serving | item	27
Number of FM radio stations | item	79
Number of AM radio stations	31
Number of metro signals	78
Antidilutive securities excluded from computation of earnings per share, amount | shares	0	0
Debt securities, held to maturity	$ 8,600,000		$ 10,600,000
Securities at fair value	8,600,000		10,600,000
Allowance for credit losses	$ 913,000		$ 618,000
Number of Radio Markets | item	27
Dividends declared per share (in dollars per share) | $ / shares	$ 0.85	$ 0.25
Cash dividends paid	$ 14,068,000	$ 13,754,000
Number of operating segments | segment	1
Number of reportable segments | segment	1
Customer relationships
Summary Of Significant Accounting Policies [Line Items]
Useful life	3 years