Note 2 - Acquisitions and Dispositions - Fair Value of Assets Acquired, Liabilities Assumed, and Goodwill from 2015 Acquisitions (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill	$ 485,318	$ 423,236	$ 374,390
Cedar Rapids [Member]
Other current assets		503
Property and equipment		13,754
Goodwill		25,006
Broadcast licenses		55,676
Other intangible assets		5,849
Other non-current assets		13
Current liabilities		(792)
Other long-term liabilities		(13)
Total		99,996
Odessa [Member]
Other current assets		87
Property and equipment		4,629
Goodwill		3,719
Broadcast licenses		22,253
Other intangible assets		3,067
Other non-current assets		13
Current liabilities		(155)
Other long-term liabilities		(13)
Total		33,600
Twin Falls [Member]
Other current assets		93
Property and equipment		5,172
Goodwill		2,587
Broadcast licenses		6,333
Other intangible assets		3,485
Other non-current assets		32
Current liabilities		(170)
Other long-term liabilities		(32)
Total		17,500
Wausau [Member]
Other current assets		87
Property and equipment		1,985
Goodwill		11,616
Broadcast licenses		0
Other intangible assets		397
Other non-current assets		87
Current liabilities		(85)
Other long-term liabilities		(87)
Total		14,000
Presque Isle [Member]
Other current assets		45
Property and equipment		2,822
Goodwill		245
Broadcast licenses		6,150
Other intangible assets		1,039
Other non-current assets		0
Current liabilities		(51)
Other long-term liabilities		0
Total		10,250
Laredo [Member]
Other current assets		22
Property and equipment		1,411
Goodwill		5,154
Broadcast licenses		0
Other intangible assets		2,435
Other non-current assets		13
Current liabilities		(22)
Other long-term liabilities		(13)
Total		$ 9,000