Note 2 - Acquisitions - Fair Value of Assets Acquired, Liabilities Assumed, and Goodwill from Acquisitions (Details) - USD ($)	Mar. 31, 2017	Jan. 17, 2017	Dec. 31, 2016
Goodwill	$ 571,708,000		$ 485,318,000
Fairbanks Acquistion [Member]
Current assets	122,000
Property and equipment	2,650,000
Goodwill	471,000
Broadcast licenses	2,228,000
Other intangible assets	2,702,000
Other non-current assets	71,000
Current liabilities	(140,000)
Other long-term liabilities	(84,000)
Total	8,020,000
Green Bay Acquisition and Davenport Acquisition [Member]
Current assets	666,000
Property and equipment	20,471,000
Goodwill	85,919,000
Broadcast licenses	149,846,000
Other intangible assets	13,398,000
Other non-current assets	282,000
Current liabilities	(695,000)
Other long-term liabilities
Total	269,887,000
2017 Acquisitions [Member]
Current assets	788,000
Property and equipment	23,121,000
Goodwill	86,390,000	$ 86,400,000
Broadcast licenses	152,074,000
Other intangible assets	16,100,000
Other non-current assets	353,000
Current liabilities	(835,000)
Other long-term liabilities	(84,000)
Total	$ 277,907,000