Acquisitions and Dispositions (Details Textual) - USD ($)			1 Months Ended		12 Months Ended
	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.