Summary of Significant Accounting Policies (Narrative) (Details)																				12 Months Ended
	Dec. 07, 2023 $ / shares	Nov. 16, 2023 $ / shares	Sep. 27, 2023 $ / shares	May 09, 2023 $ / shares	Mar. 01, 2023 $ / shares	Jan. 13, 2023 USD ($)	Dec. 07, 2022 $ / shares	Oct. 21, 2022 USD ($)	Sep. 20, 2022 $ / shares	Jul. 01, 2022 USD ($)	Jun. 06, 2022 $ / shares	Apr. 08, 2022 USD ($)	Mar. 01, 2022 $ / shares	Jan. 14, 2022 USD ($)	Dec. 14, 2021 $ / shares	Oct. 22, 2021 USD ($)	Sep. 28, 2021 $ / shares	Jul. 16, 2021 USD ($)	Jun. 18, 2021 $ / shares	Dec. 31, 2023 USD ($) segment $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) $ / shares shares	Dec. 31, 2023 USD ($)	Dec. 31, 2023	Dec. 31, 2023 item	Dec. 31, 2020 USD ($)	Mar. 31, 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																				33
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		10,600,000
Securities at fair value																					10,000,000.0		10,600,000
Write-off of debt issuance costs																				$ 36,000	10,000	$ 37,000
Net book value of deferred costs																					$ 166,000		130,000
Treasury stock shares acquired | shares																				11,274	6,044	16,577
Treasury stock acquired, average cost per share | $ / shares																				$ 20.12	$ 24.27	$ 26.25
Number of broadcast licenses																								112
Allowance for doubtful accounts receivable																					$ 519,000	$ 469,000	618,000			$ 648,000
Dividends declared per share (in dollars per share) | $ / shares																				$ 3.00	$ 4.86	$ 0.98
Cash dividends paid														$ 3,990,000		$ 960,000		$ 960,000		$ 19,875,000	$ 19,785,000	$ 1,914,000
Number of operating segments | segment																				1
Number of reportable segments | segment																				1
Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Stock repurchase program, remaining authorization amount																							$ 18,000,000.0
Dividends declared per share (in dollars per share) | $ / shares	$ 2.00	$ 0.25	$ 0.25	$ 0.25	$ 0.25		$ 0.25		$ 0.25						$ 0.16
Special cash dividend (in dollars per share) | $ / shares							$ 2.00		$ 2.00
Cash dividends paid						$ 13,800,000		$ 13,600,000
Class B Common Stock
Summary Of Significant Accounting Policies [Line Items]
Dividends declared per share (in dollars per share) | $ / shares															0.16
Common Class A and Common Class B
Summary Of Significant Accounting Policies [Line Items]
Dividends declared per share (in dollars per share) | $ / shares											$ 0.20		$ 0.16				$ 0.16		$ 0.16
Special cash dividend (in dollars per share) | $ / shares															$ 0.50
Cash dividends paid										$ 1,200,000		$ 970,000
Customer relationships
Summary Of Significant Accounting Policies [Line Items]
Useful life																				3 years
Continuing Operations
Summary Of Significant Accounting Policies [Line Items]
Depreciation																				$ 5,013,000	5,133,000	5,362,000
Advertising and promotion costs																				$ 1,705,000	$ 1,646,000	$ 1,396,000
Revenue from Rights Concentration Risk | Revenue Benchmark | Top Five Markets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk, market risk																				36.00%	38.00%	39.00%
Minimum | Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Share repurchase program, authorized amount																											$ 60,000,000
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
Maximum | Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Share repurchase program, authorized amount																											$ 75,800,000
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