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Note 7 - Other Long-term Liabilities - Summary of Other Long-term Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Other $ 7,749 $ 8,384
Total other long-term liabilities 59,642 61,538
Deferred GCI Capacity Revenue [Member]    
Deferred revenue, noncurrent 33,706 35,255
Deferred IRU Capacity Revenue [Member]    
Deferred revenue, noncurrent 16,938 15,697
Other Deferred Revenue [Member]    
Deferred revenue, noncurrent $ 1,249 $ 2,202