Note 10 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill, Gross	$ 709,696	$ 583,914	$ 521,832
Goodwill	611,100	485,318	423,236
Other intangible assets, net	73,784	56,250	53,280
Intangible Assets Gross (Including Goodwill)	2,345,082	1,986,378
Accumulated Amortization Intangible Assets	(129,495)	(104,505)
Intangible Assets, Net (Including Goodwill)	2,215,587	1,881,873	$ 1,591,142
Network Affiliate [Member]
Finite-Lived Intangible Assets, Gross	6,134	1,264
Finite-Lived Intangible Assets, Accumulated Amortization	(3,551)	(1,264)
Other intangible assets, net	2,583	0
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	143,446	105,792
Finite-Lived Intangible Assets, Accumulated Amortization	(72,245)	(49,542)
Other intangible assets, net	71,201	56,250
Intangible Assets Subject to Amortization [Member]
Finite-Lived Intangible Assets, Gross	149,580	107,056
Finite-Lived Intangible Assets, Accumulated Amortization	(75,796)	(50,806)
Other intangible assets, net	73,784	56,250
Broadcast Licenses [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill), Gross	1,584,402	1,394,004
Indefinite-Lived Intangible Assets (Excluding Goodwill), Accumulated Amortization	(53,699)	(53,699)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,530,703	1,340,305
Goodwill Not Amortizable [Member]
Goodwill, Gross	611,100	485,318
Goodwill	611,100	485,318
Intangible Assets Not Subject to Amortization [Member]
Goodwill and Indefinite-Lived Intangible Assets, Gross	2,195,502	1,879,322
Goodwill and Indefinite-lived Intangible Assets, Accumulated Amortization	(53,699)	(53,699)
Goodwill and Indefinite-Lived Assets, Net	$ 2,141,803	$ 1,825,623