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Note 9 - Other Long-term Liabilities (Tables)
3 Months Ended
Mar. 31, 2019
Notes Tables  
Other Noncurrent Liabilities [Table Text Block]
   
2019
   
2018
 
Deferred GCI capacity revenue, net of current portion
  $
30,596
    $
31,113
 
Other deferred IRU capacity revenue, net of current portion
   
25,144
     
25,732
 
Other deferred revenue, net of current portion
   
2,822
     
2,113
 
Other
   
8,907
     
8,869
 
Total other long-term liabilities
  $
67,469
    $
67,827