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Note 4 - Revenues (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Revenue from External Customers by Products and Services [Table Text Block]
   

Year Ended December 31,

 
   

2019

   

2018

   

2017

 

Residential

                       

Data

  $ 547,240     $ 492,816     $ 416,355  

Video

    335,190       343,384       332,536  

Voice

    43,521       41,278       43,733  

Business services

    204,500       155,952       131,082  

Other

    37,546       38,865       36,250  

Total revenues

  $ 1,167,997     $ 1,072,295     $ 959,956