Note 11 - Subsequent Events - Preliminary Assets Acquired, Liabilities Assumed, and Goodwill from 2017 Acquisitions (Details) - USD ($) $ in Thousands	Feb. 28, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill		$ 485,318	$ 423,236	$ 374,390
Subsequent Event [Member] | Fairbanks Acquistion [Member]
Other current assets	$ 176
Property and equipment	2,868
Goodwill	251
Broadcast licenses	2,228
Other intangible assets	2,653
Current liabilities	(176)
Total	8,000
Subsequent Event [Member] | Green Bay Acquisition [Member]
Other current assets	238
Property and equipment	10,133
Goodwill	44,055
Broadcast licenses	82,845
Other intangible assets	7,767
Current liabilities	(238)
Total	144,800
Subsequent Event [Member] | Davenport Acquisition [Member]
Other current assets	301
Property and equipment	10,276
Goodwill	45,305
Broadcast licenses	63,683
Other intangible assets	5,936
Current liabilities	(301)
Total	$ 125,200