Summary of Significant Accounting Policies (Narrative) (Details)										12 Months Ended
	Dec. 14, 2021 USD ($) $ / shares	Sep. 28, 2021 USD ($) $ / shares	Jun. 18, 2021 USD ($) $ / shares	Mar. 04, 2020 USD ($) $ / shares	Dec. 11, 2019 USD ($) $ / shares	Sep. 12, 2019 USD ($) $ / shares	Jul. 05, 2019 USD ($)	May 30, 2019 $ / shares	Feb. 26, 2019 USD ($) $ / shares	Dec. 31, 2021 USD ($) segment $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2021 USD ($)	Dec. 31, 2021	Dec. 31, 2021 item	Dec. 31, 2018 USD ($)	Mar. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number Of FM Radio Stations										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
Number of reportable segments | segment										1
Interest-bearing Deposits in Banks and Other Financial Institutions											$ 0		$ 0
Amortization of debt issuance costs										$ 37,000	40,000	$ 103,000
Write-off of debt issuance costs										$ 37,000	40,000	$ 103,000
Other Deferred Costs, Net											$ 64,000		17,000
Treasury Stock, Shares, Acquired | shares										16,577	24,255	39,505
Treasury Stock Acquired, Average Cost Per Share | $ / shares										$ 26.25	$ 18.51	$ 29.68
Dividends Payable, Date Declared	Dec. 14, 2021	Sep. 28, 2021	Jun. 18, 2021
Dividends declared per share | $ / shares										$ 0.98	$ 0.32	$ 1.20
Dividends	$ 3,990,000	$ 960,000	$ 960,000
Dividends Payable, Date to be Paid	Jan. 14, 2022	Oct. 22, 2021	Jul. 16, 2021
Dividends Payable, Date of Record	Dec. 27, 2021	Oct. 08, 2021	Jun. 30, 2021
Dividends, Common Stock, Stock				$ 1,900,000	$ 1,800,000	$ 1,800,000	$ 1,800,000		$ 1,800,000
Number Of Broadcast Licenses														113
Number Of Market Serving														27	27
Operating Lease, Right-of-Use Asset											$ 6,600,000		6,100,000
Operating Lease, Liability, Statement of Financial Position [Extensible Enumeration]										Accrued Liabilities, Current, Other Liabilities, Noncurrent	Accrued Liabilities, Current, Other Liabilities, Noncurrent
Number of operating segments | segment										1
Operating Lease, Liability											$ 6,900,000		6,426,000
Allowance for doubtful accounts receivable											648,000	$ 671,000	469,000			$ 759,000
Customer relationships [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life										3 years
Continuing Operations [Member]
Summary Of Significant Accounting Policies [Line Items]
Depreciation										$ 5,362,000	5,711,000	5,916,000
Advertising and promotion costs										$ 1,396,000	$ 985,000	$ 2,442,000
Revenue from Rights Concentration Risk | Revenue Benchmark | Top Five Markets
Summary Of Significant Accounting Policies [Line Items]
Concentration Risk, Percentage										39.00%	40.00%	39.00%
Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Dividends declared per share | $ / shares	$ 0.16
Stock Repurchase Program, Remaining Authorized Repurchase Amount													$ 18,400,000
Class B Common Stock
Summary Of Significant Accounting Policies [Line Items]
Dividends declared per share | $ / shares	0.16
Common Class A and Common Class B
Summary Of Significant Accounting Policies [Line Items]
Dividends declared per share | $ / shares		$ 0.16	$ 0.16
Common Stock, Dividends, Per Share, Cash Paid | $ / shares	$ 0.50			$ 0.32	$ 0.30	$ 0.30		$ 0.30	$ 0.30
Minimum [Member] | Lease Agreements [Member
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life										1 year
Minimum [Member] | Other intangibles [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life										1 year
Minimum [Member] | Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Stock Repurchase Program, Authorized Amount																		$ 60,000,000
Maximum [Member] | Lease Agreements [Member
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life										26 years
Maximum [Member] | Other intangibles [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life										15 years
Maximum [Member] | Class A Common Stock
Summary Of Significant Accounting Policies [Line Items]
Stock Repurchase Program, Authorized Amount																	$ 75,800,000