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Acquisitions and Dispositions (Details Textual) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |
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Sep. 02, 2017 | May 09, 2017 | Jan. 31, 2019 | Oct. 29, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | [1] | Jan. 16, 2017
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  | $ 9,300,000 | $ 9,961,000 |  | $ 26,324,000 |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  | $ 23,000,000 |  | 9,300,000 |  |  |  |  |  |
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net | $ 1,300,000 | 3,400,000 |  |  | 566,000 |  |  |  |  |
Discontinued Operation, Disposal of Discontinued Operation, Transaction Costs |  |  |  | $ 25,000 | 50,000 |  |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 24,200,000 | 24,200,000 |  |  |  |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross |  |  | $ 552,000 |  |  |  |  |  |  |
Joplin, Missouri and Victoria, Texas Television Stations [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  | 69,500,000 |  |  | 0 | [1] | $ 69,528,000 | [1] | $ 0 |
Disposal Group, Including Discontinued Operation, Consideration |  | 66,600,000 |  |  | 66,600,000 |  |  |  |  |
Discontinued Operation, Disposal of Discontinued Operation, Transaction Costs |  | 500,000 |  |  |  |  |  |  |  |
Ocala Broadcasting Corp [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Divestiture of Businesses, Net of Cash Divested |  |  |  |  | $ 9,840,000 |  |  |  |  |
Apex Real Property Llc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | $ 23,000,000 |  |  |  |  |  |  |  |
Virginia Market [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  |  |  |  |  |  |  |  |  | $ 1,658,000
Business Acquisition, Transaction Costs |  |  |  |  |  |  |  |  |  | $ 8,000
[1] | Net proceeds from the sale of the television stations reflect the sales price of $66.6 million, the sale of accounts receivable of approximately $3.4 million, offset by certain closing adjustments and transactional costs of approximately $500 thousand.

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