Summary of Significant Accounting Policies (Narrative) (Details)							12 Months Ended
	Dec. 07, 2022 USD ($) $ / shares	Sep. 20, 2022 USD ($) $ / shares	Jun. 06, 2022 USD ($) $ / shares	Mar. 01, 2022 USD ($) $ / shares	Dec. 14, 2021 $ / shares	Mar. 04, 2020 USD ($) $ / shares	Dec. 31, 2022 USD ($) segment $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2022	Dec. 31, 2022 item	Dec. 31, 2019 USD ($)	Mar. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of market serving										27	27
Number of FM radio stations							79
Number of AM radio stations							34
Number of metro signals							80
Antidilutive securities excluded from computation of earnings per share, amount | shares							0	0	0
Time deposits							$ 0	$ 0
Securities at amortized cost							10,100,000
Securities at fair value							10,000,000
Marketable securities								0
Amortization of debt issuance costs							10,000	37,000	$ 40,000
Write-off of debt issuance costs							10,000	37,000	$ 40,000
Net book value of deferred costs							$ 166,000	$ 17,000
Treasury stock shares acquired | shares							6,044	16,577	24,255
Treasury stock acquired, average cost per share | $ / shares							$ 24.27	$ 26.25	$ 18.51
Dividend paid						$ 1,900,000
Number of broadcast licenses										113
Allowance for doubtful accounts receivable							$ 519,000	$ 469,000	$ 648,000			$ 671,000
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
Continuing Operations [Member]
Summary Of Significant Accounting Policies [Line Items]
Depreciation							$ 5,133,000	5,362,000	5,711,000
Advertising and promotion costs							$ 1,646,000	$ 1,396,000	$ 985,000
Revenue from Rights Concentration Risk | Revenue Benchmark | Top Five Markets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, market risk							38.00%	39.00%	40.00%
Common Class A and Common Class B
Summary Of Significant Accounting Policies [Line Items]
Cash dividend paid | $ / shares			$ 0.20	$ 0.16	$ 0.50	$ 0.32
Dividend paid			$ 1,200,000	$ 970,000
Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Cash dividend paid | $ / shares	$ 0.25	$ 0.25
Dividend paid	$ 13,800,000	$ 13,600,000
Stock repurchase program, remaining authorization amount							$ 18,200,000
Dividends Payable, Amount Per Share | $ / shares	$ 2.00	$ 2.00
Minimum | Lease Agreements
Summary Of Significant Accounting Policies [Line Items]
Useful life							1 year
Minimum | Other intangibles
Summary Of Significant Accounting Policies [Line Items]
Useful life							1 year
Minimum | Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Share repurchase program, authorized amount														$ 60,000,000
Maximum | Lease Agreements
Summary Of Significant Accounting Policies [Line Items]
Useful life							26 years
Maximum | Other intangibles
Summary Of Significant Accounting Policies [Line Items]
Useful life							15 years
Maximum | Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Share repurchase program, authorized amount													$ 75,800,000