Note 12 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill	$ 612,000
Goodwill, Net additions	822,000
Goodwill	1,434,000
Broadcast licenses	1,530,000
Broadcast licenses	3,534,000
Finite-lived intangible assets	53,000
Finite-lived Intangible Assets Acquired	493,000
Amortization of Intangible Assets	(29,000)	$ (5,000)
Finite-lived intangible assets	517,000
Total intangible assets net of accumulated amortization	2,195,000
Total intangible assets net of accumulated amortization, Net additions	3,319,000
Total intangible assets net of accumulated amortization	5,485,000
Broadcast Licenses [Member]
Broadcast licenses	1,530,000
Broadcast licenses, Net additions	2,004,000
Broadcast licenses	$ 3,534,000