Note 2 - Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue	$ 250,344	$ 226,681	$ 476,602	$ 430,142
Sales Channel, Directly to Consumer [Member]
Revenue	135,302	120,292	268,724	234,814
Sales Channel, Through Intermediary [Member]
Revenue	115,042	106,389	207,878	195,328
Local Advertising [Member]
Revenue	112,921	117,917	218,390	220,514
National Advertising [Member]
Revenue	29,873	30,981	54,385	55,795
Political Advertising [Member]
Revenue	18,070	3,708	23,845	5,029
Advertising [Member]
Revenue	160,864	152,606	296,620	281,338
Retransmission Consent [Member]
Revenue	85,307	69,371	170,858	136,944
Service, Other [Member]
Revenue	$ 4,173	$ 4,704	$ 9,124	$ 11,860