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Summary of Significant Accounting Policies (Details Textual) |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Dec. 11, 2019 USD ($) $ / shares | Sep. 12, 2019 USD ($) $ / shares | Jul. 05, 2019 USD ($) | May 30, 2019 $ / shares | Feb. 26, 2019 USD ($) $ / shares | Sep. 14, 2018 USD ($) $ / shares | May 15, 2018 USD ($) $ / shares | Dec. 07, 2017 USD ($) $ / shares | Sep. 13, 2017 USD ($) $ / shares | May 03, 2017 USD ($) $ / shares | Mar. 03, 2017 USD ($) $ / shares | Nov. 28, 2018 USD ($) $ / shares | Feb. 28, 2018 USD ($) $ / shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number Of FM Radio Stations |  |  |  |  |  |  |  |  |  |  |  |  |  | 79 |  |  |
Number Of AM Radio Stations |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 |  |  |
Number Of Metro Signals |  |  |  |  |  |  |  |  |  |  |  |  |  | 77 |  |  |
Number of Reportable Segments |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 | 1 | 1 |
Concentration Risk, Market Risk |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% | 41.00% | 41.00% |
Interest expense related to the amortization of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 103,000 | $ 51,000 | $ 53,000 |
Write-off of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 103,000 | 51,000 | $ 53,000 |
Net book value of deferred costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 104,000 | $ 207,000 |  |
Treasury Stock, Shares, Acquired | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,505 | 53,713 | 37,141 |
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 29.68 | $ 37.24 | $ 47.72 |
Special cash dividend declared on Classes A and B Common Stock | $ / shares | $ 0.30 | $ 0.30 |  | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 1.20 | $ 1.45 | $ 2.00 |
Dividend paid | $ 1,800,000 | $ 1,800,000 | $ 1,800,000 |  | $ 1,800,000 | $ 1,800,000 | $ 1,800,000 | $ 6,500,000 | $ 1,800,000 | $ 1,800,000 | $ 1,800,000 | $ 3,300,000 | $ 1,800,000 |  |  |  |
Number Of Broadcast Licenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 113 |  |  |
Number Of Market Serving |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |
Dividends Payable, Amount Per Share | $ / shares |  |  |  |  |  |  |  | $ 0.80 |  |  |  | $ 0.25 |  |  |  |  |
Debt Issuance Costs, Net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 120,000 | $ 120,000 |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,900,000 |  |  |
Operating Lease, Liability, Statement of Financial Position [Extensible List] |  |  |  |  |  |  |  |  |  |  |  |  |  | Operating Lease, Liability |  |  |
Operating Lease, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,997,000 |  |  |
Customer relationships [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Accounting Standards Update 2016-02 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Lease, Right-of-Use Asset |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,700,000
Operating Lease, Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,700,000
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,916,000 | 5,692,000 | $ 5,391,000 |
Advertising and promotion costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,442,000 | 2,438,000 | 2,441,000 |
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 445,000 |
Advertising and promotion costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 240,000 |
Class A Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,200,000 |  |  |
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 |  |  |

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