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Acquisitions and Dispositions (Details Textual) - USD ($) | Sep. 01, 2015 | Dec. 31, 2016 | Dec. 02, 2016 | Nov. 14, 2016 | Nov. 08, 2016 | Oct. 11, 2016 | Sep. 12, 2016 | Aug. 11, 2016 | Jun. 03, 2016 | Apr. 11, 2016 | Apr. 08, 2016 | Mar. 25, 2016 | Mar. 16, 2016 | Dec. 31, 2015 | Nov. 23, 2015 | Nov. 12, 2015 | Nov. 02, 2015 | Oct. 23, 2015 | Aug. 26, 2015 | Aug. 01, 2015 | Jul. 13, 2015
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Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  | $ 14,243,000 |  |  |  |  |  |  |  |  |  |  |  | $ 11,980,000 |  |  |  |  |  |  |
Belmont Verstandig Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,131,000 |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 128,000 |
Gamma Broadcasting, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 1,558,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition, Transaction Costs | 92,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FM Translator [Member] | Manchester, New Hampshire Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 45,000
FM Translator [Member] | Gamma Broadcasting, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FM Translator [Member] | Portland, Maine market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |
FM Translator [Member] | Milwaukee, Wisconsin Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |
FM Station [Member] | Asheville, North Carolina Market [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 125,000 |  |
FM Station [Member] | Gamma Broadcasting, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FM Station [Member] | Wilks Broadcast - Columbus, LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets, Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,791,000 |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 734,000 |  |  |  |
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 57,000 |  |  |  |
Illinois Radio Network [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale, Carrying Value of Asset |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000 |  |  |  |  |  |  |
Tennessee Market [Member] | FM Translator Serving the Charlottesville [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |  |  |  |  |  |  |
Iowa Market [Member] | FM Translator Serving the Spencer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |
Iowa Market [Member] | FM Translator Serving Des Moines [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  | $ 25,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Virginia Market [Member] | FM Translator Serving the Charlottesville [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  |  |  | $ 150,000 |  |  | $ 30,000 |  |  |
Washington Market [Member] | FM Translator Serving the Bellingham [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  | $ 25,000 |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Maine market [Member] | FM Translator Serving the Portland [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | $ 45,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Illinois Market [Member] | FM Translator Serving Springfield [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 23,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
New York Market [Member] | FM Translator Serving Ithaca [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  | $ 35,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ohio Market [Member] | FM Translator Serving the Bucyrus [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |

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