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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($)
Mar. 31, 2017
Dec. 31, 2016
Accumulated Amortization $ (110,071,000) $ (104,505,000)
Net 1,492,379,000 1,340,305,000
Net 571,708,000 485,318,000
Gross 2,244,942,000 1,986,378,000
Net 2,134,871,000 1,881,873,000
Net 2,134,871,000 1,881,873,000
Network Affiliate [Member]    
Accumulated Amortization (1,612,000) (1,264,000)
Gross 5,264,000 1,264,000
Net 3,652
Other Intangible Assets [Member]    
Accumulated Amortization (54,760,000) (49,542,000)
Gross 121,892,000 105,792,000
Net 67,132,000 56,250,000
Intangible Assets Subject to Amortization [Member]    
Accumulated Amortization (56,372,000) (50,806,000)
Gross 127,156,000 107,056,000
Net 70,784,000 56,250,000
Broadcast Licenses [Member]    
Gross 1,546,078,000 1,394,004,000
Accumulated Amortization (53,699,000) (53,699,000)
Net 1,492,379,000 1,340,305,000
Goodwill Not Amortizable [Member]    
Gross 571,708,000 485,318,000
Net 571,708,000 485,318,000
Intangible Assets Not Subject to Amortization [Member]    
Accumulated Amortization (53,699,000) (53,699,000)
Gross 2,117,786,000 1,879,322,000
Net $ 2,064,087,000 $ 1,825,623,000