Note 11 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 30, 2016
Goodwill, Gross	$ 711,021	$ 709,696	$ 583,914
Goodwill	612,425	611,100	485,318	$ 485,318
Other intangible assets, net	53,214	73,784	56,250
Intangible Assets Gross (Including Goodwill)	2,345,251	2,345,082
Accumulated Amortization Intangible Assets	(150,038)	(129,495)
Intangible Assets, Net (Including Goodwill)	2,195,213	2,215,587	$ 1,881,873
Network Affiliate [Member]
Finite-Lived Intangible Assets, Gross	6,134	6,134
Finite-Lived Intangible Assets, Accumulated Amortization	(6,134)	(3,551)
Other intangible assets, net		2,583
Finite-Lived Intangible Assets, Accumulated Amortization	6,134	3,551
Other Intangible Assets [Member]
Finite-Lived Intangible Assets, Gross	143,419	143,446
Finite-Lived Intangible Assets, Accumulated Amortization	90,205	72,245
Other intangible assets, net	53,214	71,201
Finite-Lived Intangible Assets, Accumulated Amortization	(90,205)	(72,245)
Intangible Assets Subject to Amortization [Member]
Finite-Lived Intangible Assets, Gross	149,553	149,580
Finite-Lived Intangible Assets, Accumulated Amortization	(96,339)	(75,796)
Other intangible assets, net	53,214	73,784
Finite-Lived Intangible Assets, Accumulated Amortization	96,339	75,796
Broadcast Licenses [Member]
Indefinite-lived Intangible Assets (Excluding Goodwill), Gross	1,583,273	1,584,402
Indefinite-Lived Intangible Assets (Excluding Goodwill), Accumulated Amortization	(53,699)	(53,699)
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,529,574	1,530,703
Goodwill Not Amortizable [Member]
Goodwill, Gross	612,425	611,100
Goodwill	612,425	611,100
Intangible Assets Not Subject to Amortization [Member]
Goodwill and Indefinite-Lived Intangible Assets, Gross	2,195,698	2,195,502
Goodwill and Indefinite-lived Intangible Assets, Accumulated Amortization	(53,699)	(53,699)
Goodwill and Indefinite-Lived Assets, Net	$ 2,141,999	$ 2,141,803