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Summary of Significant Accounting Policies (Details Textual) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jun. 10, 2015 USD ($) $ / shares | Dec. 03, 2014 USD ($) $ / shares | Nov. 17, 2015 USD ($) $ / shares | Sep. 02, 2015 USD ($) $ / shares | Mar. 25, 2015 USD ($) $ / shares | Sep. 23, 2014 USD ($) $ / shares | Jun. 30, 2014 USD ($) $ / shares | Nov. 21, 2013 USD ($) $ / shares | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Four-for-three stock split |  |  |  |  |  |  |  |  |  |  |  |  |  | The stock split increased the Companys issued and outstanding shares of common stock from 3,659,753 shares of Class A Common Stock and 597,504 shares of Class B Common Stock to 4,879,186 and 796,672 shares, respectively. |  |
Number of stock options outstanding having antidilutive effect | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 45,000 | 13,000
Concentration Risk, Market Risk |  |  |  |  |  |  |  |  |  |  |  |  |  | 44.00% | 43.00% | 44.00%
Depreciation expense |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,593,000 | $ 6,648,000 | $ 6,716,000
Interest expense related to the amortization of debt issuance costs |  |  |  |  |  |  |  |  |  |  |  |  |  | 131,000 | 187,000 | 204,000
Write-off debt issuance costs |  |  |  |  |  |  |  |  | $ 557,000 | $ 0 | $ 0 | $ 0 | $ 0 | 557,000 | 0 | $ 55,000
Net book value of deferred costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 244,000 | $ 636,000 |
Treasury Stock, Shares, Acquired | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,384 | 6,165 | 2,179
Treasury Stock Acquired, Average Cost Per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 36.53 | $ 41.15 | $ 43.98
Advertising and promotion costs |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,804,000 | $ 3,056,000 | $ 3,225,000
Special cash dividend declared on Classes A and B Common Stock | $ / shares | $ 0.20 | $ 1.20 | $ 0.25 | $ 0.20 | $ 0.20 | $ 0.20 | $ 0.20 | $ 1.80 |  |  |  |  |  | $ 1.1 | $ 1.8 | $ 1.8
Dividend paid | $ 1,200,000 | $ 8,200,000 | $ 2,900,000 | $ 1,200,000 | $ 1,200,000 | $ 1,100,000 | $ 1,100,000 | $ 10,300,000 |  |  |  |  |  |  |  |
Number Of Broadcast Licenses |  |  |  |  |  |  |  |  |  |  |  |  |  | 107 |  |
Number Of Market Serving |  |  |  |  |  |  |  |  |  |  |  |  |  | 26 |  |
Dividends Payable, Amount Per Share | $ / shares |  | $ 0.20 | $ 0.25 |  |  |  |  |  |  |  |  |  |  |  |  |
Class A Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 24,900,000 |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 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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