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Note 2 - Acquisitions (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
May 01, 2017
Jan. 17, 2017
Jan. 13, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Goodwill       $ 610,494   $ 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       85,997    
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    
2017 Acquisitions [Member]            
Business Acquisition, Operating Income (Loss) from Continuing Operations Before Changes in Accounting and Extraordinary Items, Net of Tax       15,700    
Business Combination, Acquisition Related Costs       1,000    
Goodwill       125,176    
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual       31,800    
2017 Acquisitions [Member] | Retransmission Agreements [Member]            
Finite-Lived Intangible Assets, Gross       $ 21,500    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       5 years 73 days    
2017 Acquisitions [Member] | Advertising Relationships [Member]            
Finite-Lived Intangible Assets, Gross       $ 4,100    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       4 years 73 days    
2017 Acquisitions [Member] | Income Leases [Member]            
Finite-Lived Intangible Assets, Gross       $ 2,500    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life       12 years 219 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 Acquisition, Operating Income (Loss) from Continuing Operations Before Changes in Accounting and Extraordinary Items, Net of Tax         $ 19,000  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual         $ 50,700