Note 10 - Subsequent Events - Preliminary Assets Acquired, Liabilities Assumed, and Goodwill from 2017 Acquisitions (Details) - USD ($) $ in Thousands	May 01, 2017	Mar. 31, 2017	Dec. 31, 2016
Goodwill		$ 571,708	$ 485,318
Subsequent Event [Member]
Property and equipment	$ 16,500
Goodwill	33,000
Broadcast licenses	47,500
Other intangible assets	14,500
Total	111,500
Clarksburg Acquisition [Member] | Subsequent Event [Member]
Property and equipment	3,000
Goodwill	3,000
Broadcast licenses	20,000
Other intangible assets	500
Total	26,500
Bangor Acquisition and Gainesville Acquisition [Member] | Subsequent Event [Member]
Property and equipment	13,500
Goodwill	30,000
Broadcast licenses	27,500
Other intangible assets	14,000
Total	$ 85,000