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Note 6 - Property, Plant and Equipment (Tables)
3 Months Ended
Mar. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
March 31, 2018
   
December 31, 2017
 
Cable distribution systems
  $
1,347,100
    $
1,329,451
 
Customer premise equipment
   
200,859
     
200,175
 
Other equipment and fixtures
   
382,017
     
378,968
 
Buildings and leasehold improvements
   
95,985
     
95,314
 
Capitalized software
   
94,852
     
89,773
 
Construction in progress
   
60,293
     
67,564
 
Land
   
11,565
     
11,585
 
Property, plant and equipment, gross
   
2,192,671
     
2,172,830
 
Less: Accumulated depreciation
   
(1,372,662
)    
(1,340,938
)
Property, plant and equipment, net
  $
820,009
    $
831,892