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Summary of Significant Accounting Policies (Details Textual) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Dec. 07, 2017 USD ($) $ / shares | Sep. 13, 2017 USD ($) $ / shares | May 03, 2017 USD ($) $ / shares | Mar. 03, 2017 USD ($) $ / shares | Jun. 01, 2016 USD ($) $ / shares | Mar. 02, 2016 USD ($) $ / shares | Sep. 02, 2015 USD ($) $ / shares | Jun. 10, 2015 USD ($) $ / shares | Nov. 21, 2016 USD ($) $ / shares | Aug. 30, 2016 USD ($) $ / shares | Nov. 17, 2015 USD ($) $ / shares | Mar. 25, 2015 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of stock options outstanding having antidilutive effect | shares |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Concentration Risk, Market Risk |  |  |  |  |  |  |  |  |  |  |  |  | 46.00% | 48.00% | 46.00%
Interest expense related to the amortization of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 53,000 | $ 53,000 | $ 131,000
Write-off of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | $ 557,000
Net book value of deferred costs |  |  |  |  |  |  |  |  |  |  |  |  | $ 138,000 | $ 191,000 |
Treasury Stock, Shares, Acquired | shares |  |  |  |  |  |  |  |  |  |  |  |  | 37,141 | 18,612 | 129,384
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 47.72 | $ 40.06 | $ 36.53
Special cash dividend declared on Classes A and B Common Stock | $ / shares | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.25 | $ 0.25 | $ 0.20 | $ 0.20 | $ 0.30 | $ 0.30 | $ 0.25 | $ 0.20 | $ 2 | $ 1.3 | $ 1.1
Dividend paid | $ 6,500,000 | $ 1,800,000 | $ 1,800,000 | $ 1,800,000 | $ 1,500,000 | $ 1,500,000 | $ 1,200,000 | $ 1,200,000 | $ 2,900,000 | $ 1,800,000 | $ 2,900,000 | $ 1,200,000 |  |  |
Number Of Broadcast Licenses |  |  |  |  |  |  |  |  |  |  |  |  | 108 |  |
Number Of Market Serving |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |
Dividends Payable, Amount Per Share | $ / shares | $ 0.80 |  |  |  |  |  |  |  |  |  | $ 0.25 |  |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Current, Total |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000 | $ 1,022,000 |
Continuing Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 5,391,000 | 5,234,000 | $ 5,194,000
Advertising and promotion costs |  |  |  |  |  |  |  |  |  |  |  |  | 2,441,000 | 2,633,000 | 2,475,000
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  | 445,000 | 1,387,000 | 1,399,000
Advertising and promotion costs |  |  |  |  |  |  |  |  |  |  |  |  | 240,000 | $ 341,000 | $ 328,000
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  | 22,400,000 |  |
Minimum [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | 60,000,000 |  |
Maximum [Member] | Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Authorized Amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 75,800,000 |  |
Favorable Lease Agreements [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized over the lives of the leases term range |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Favorable Lease Agreements [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortized over the lives of the leases term range |  |  |  |  |  |  |  |  |  |  |  |  | 26 years |  |

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