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Note 5 - Revenues (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
   
Three Months Ended
March 31,
 
   
2018
   
2017
 
Residential
               
Data
  $
118,487
    $
90,201
 
Video
   
88,757
     
72,454
 
Voice
   
10,671
     
9,867
 
Business services
   
37,691
     
26,968
 
Advertising sales
   
5,241
     
5,622
 
Other    
4,914
     
2,322
 
Total revenues
  $
265,761
    $
207,434