Note 12 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Goodwill			$ 612,000
Goodwill, Net additions			1,069,000
Goodwill			(229,000)
Goodwill	$ 1,452,000		1,452,000
Broadcast licenses			1,530,000
Broadcast licenses			0
Broadcast licenses	3,558,000		3,558,000
Finite-lived intangible assets			53,000
Finite-lived Intangible Assets Acquired			501,000
Amortization of Intangible Assets	(28,000)	$ (5,000)	(57,000)	$ (11,000)
Finite-lived intangible assets	497,000		497,000
Total intangible assets net of accumulated amortization			2,195,000
Total intangible assets net of accumulated amortization, Net additions			3,598,000
Total intangible assets net of accumulated amortization			(229,000)
Total intangible assets net of accumulated amortization	5,507,000		5,507,000
Broadcast Licenses [Member]
Broadcast licenses			1,530,000
Broadcast licenses, Net additions			2,028,000
Broadcast licenses			0
Broadcast licenses	$ 3,558,000		$ 3,558,000