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Note 10 - Subsequent Events (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
May 01, 2017
Apr. 03, 2017
May 31, 2016
Sep. 30, 2017
May 01, 2017
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2017
May 01, 2017
Jun. 30, 2017
Feb. 07, 2017
Dec. 31, 2016
Goodwill           $ 571,708           $ 485,318
Proceeds from Issuance of Long-term Debt           556,438 $ 425,000          
Scenario, Forecast [Member] | FCC [Member]                        
Proceeds from Reverse Auction for Broadcast Spectrum               $ 90,800        
The 2017 Senior Credit Facility [Member]                        
Debt Issuance Costs, Gross           $ 4,600            
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member]                        
Debt Instrument, Quarterly Principal Payment                     $ 1,400  
The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member] | Scenario, Forecast [Member]                        
Debt Instrument, Quarterly Principal Payment                   $ 1,600    
Subsequent Event [Member]                        
Goodwill $ 33,000       $ 33,000       $ 33,000      
Subsequent Event [Member] | The 2017 Senior Credit Facility [Member] | The 2017 Term Loan [Member]                        
Proceeds from Issuance of Long-term Debt   $ 85,000                    
Debt Instrument, Quarterly Principal Payment   1,600                    
Debt Issuance Costs, Gross   400                    
Subsequent Event [Member] | Minimum [Member]                        
Property, Plant and Equipment, Useful Life 3 years                      
Subsequent Event [Member] | Maximum [Member]                        
Property, Plant and Equipment, Useful Life 40 years                      
Clarksburg Acquisition [Member]                        
Payments to Acquire Businesses, Gross     $ 16,500                  
Clarksburg Acquisition [Member] | Subsequent Event [Member]                        
Business Combination, Consideration Transferred                 26,500      
Payments to Acquire Businesses, Gross $ 10,000                      
Goodwill 3,000       3,000       3,000      
Bangor Acquisition and Gainesville Acquisition [Member] | Subsequent Event [Member]                        
Business Combination, Consideration Transferred         85,000              
Payments to Acquire Businesses, Gross   $ 68,000                    
Goodwill $ 30,000       $ 30,000       $ 30,000      
Burlington and Plattsburg Acquisition [Member] | Scenario, Forecast [Member]                        
Payments to Acquire Businesses, Gross       $ 29,000