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Note 11 - Other Long-term Liabilities (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Other Noncurrent Liabilities [Table Text Block]
   
2018
   
2017
 
Deferred GCI capacity revenue, net of current portion
  $
31,113
    $
33,184
 
Other deferred IRU capacity revenue, net of current portion
   
25,732
     
19,366
 
Other deferred revenue, net of current portion
   
2,113
     
1,391
 
Other
   
8,869
     
7,389
 
Total other long-term liabilities
  $
67,827
    $
61,330