Discontinued Operations (Details Textual) - USD ($)				9 Months Ended
	Nov. 03, 2017	Oct. 05, 2017	May 09, 2017	Sep. 30, 2018		Sep. 30, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Disposal Group, Including Discontinued Operation, Consideration			$ 23,000,000	$ 23,000,000
Disposal Group, Including Discontinued Operation, Income Tax Rate				41.00%
Discontinued Operation, Disposal of Discontinued Operation ,Transaction Costs				$ 50,000		$ 50,000
Proceeds from Divestiture of Businesses, Net of Cash Divested				0		69,528,000
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net				1,300,000
Payments to Acquire Businesses, Net of Cash Acquired				24,200,000
Revolving Credit Facility [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Repayments of Lines of Credit	$ 5,000,000	$ 5,287,000
Joplin, Missouri and Victoria, Texas Television Stations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Recognized gain on net of tax			29,900,000
Disposal Group, Including Discontinued Operation, Consideration			66,600,000	66,600,000
Discontinued Operation, Disposal of Discontinued Operation ,Transaction Costs			500,000	500,000
Proceeds from Divestiture of Businesses, Net of Cash Divested			69,500,000	0	[1]	$ 69,528,000	[1]
Disposal Group, Including Discontinued Operation, Accounts, Notes and Loans Receivable, Net				3,400,000
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal				$ 50,800,000
Payments to Acquire Businesses, Net of Cash Acquired			$ 3,400,000

[1] Net proceeds from the sale of the television stations reflect the sale price of $66.6 million, and the proceeds from sale of accounts receivable of approximately $3.4 million, offset by certain closing adjustments and transactional costs of approximately $500 thousand.