Note 9 - Goodwill and Intangible Assets (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Amortization of Intangible Assets, Total	$ 4,998	$ 6,460	$ 15,587	$ 18,684
Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year	5,000		5,000
Finite-Lived Intangible Assets, Amortization Expense, Year Two	15,400		15,400
Finite-Lived Intangible Assets, Amortization Expense, Year Three	12,400		12,400
Finite-Lived Intangible Assets, Amortization Expense, Year Four	8,300		8,300
Finite-Lived Intangible Assets, Amortization Expense, Year Five	4,800		4,800
Finite-Lived Intangible Assets, Amortization Expense, Year Six	2,900		2,900
Goodwill, Impairment Loss			0	0
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			$ 0	$ 0
WCAX-TV [Member]
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles	3,100
Goodwill, Purchase Accounting Adjustments	$ 3,100