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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
9 Months Ended
Aug. 01, 2017
Jun. 01, 2017
May 01, 2017
Jan. 17, 2017
Jan. 13, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Finite-Lived Intangible Assets, Gross           $ 149,580   $ 107,056
Goodwill           611,100   $ 485,318
Fairbanks Acquistion [Member]                
Payments to Acquire Businesses, Gross         $ 8,000      
Goodwill           471    
Green Bay Acquisition and Davenport Acquisition [Member]                
Business Combination, Consideration Transferred       $ 269,900        
Goodwill           86,287    
Clarksburg Acquisition [Member]                
Business Combination, Consideration Transferred     $ 26,500          
Goodwill           3,222    
Bangor Acquisition and Gainesville Acquisition [Member]                
Business Combination, Consideration Transferred     $ 85,000          
Goodwill           35,486    
Burlington and Plattsburg Acquisition [Member]                
Payments to Acquire Businesses, Gross $ 5,800 $ 23,200            
Business Combination, Consideration Transferred $ 29,000              
Goodwill           316    
2017 Acquisitions [Member]                
Goodwill           125,782    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual           54,200    
Business Acquisition, Operating Income (Loss) from Continuing Operations Before Changes in Accounting and Extraordinary Items, Net of Tax           25,200    
Business Combination, Acquisition Related Costs           1,000    
2017 Acquisitions [Member] | Retransmission Agreements [Member]                
Finite-Lived Intangible Assets, Gross           $ 29,100    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life           4 years 328 days    
2017 Acquisitions [Member] | Advertising Relationships [Member]                
Finite-Lived Intangible Assets, Gross           $ 5,300    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life           10 years 255 days    
2017 Acquisitions [Member] | Income Leases [Member]                
Finite-Lived Intangible Assets, Gross           $ 3,000    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life           11 years 328 days    
2017 Acquisitions [Member] | Minimum [Member]                
Property, Plant and Equipment, Useful Life           3 years    
2017 Acquisitions [Member] | Maximum [Member]                
Property, Plant and Equipment, Useful Life           40 years    
2016 Acquisitions [Member]                
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual             $ 87,900  
Business Acquisition, Operating Income (Loss) from Continuing Operations Before Changes in Accounting and Extraordinary Items, Net of Tax             $ 35,300