Note 11 - Goodwill and Intangible Assets - Changes in Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill beginning of year	$ 611,100	$ 485,318
Goodwill, Acquired During Period	3,077	125,782	$ 72,300
Goodwill	(1,752)	0
Goodwill end of year	612,425	611,100	485,318
Broadcast licenses	1,530,703
Broadcast licenses	0	0
Broadcast licenses	1,529,574	1,530,703
Finite-lived intangible assets	73,784	56,250
Finite-lived Intangible Assets Acquired	0	42,606
Finite-lived intangible assets	(20,570)	(25,072)	(16,596)
Finite-lived intangible assets	53,214	73,784	56,250
Total intangible assets net of accumulated amortization	2,215,587	1,881,873
Total intangible assets net of accumulated amortization	3,502	371,891
Total intangible assets net of accumulated amortization	(3,306)	(13,105)
Total intangible assets net of accumulated amortization	2,195,213	2,215,587	1,881,873
Broadcast Licenses [Member]
Broadcast licenses	1,530,703	1,340,305
Broadcast licenses	425	203,503
Broadcast licenses	(1,554)	(13,105)
Broadcast licenses	$ 1,529,574	$ 1,530,703	$ 1,340,305