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Note 11 - Other Long-term Liabilities - Summary of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Other		$ 7,389	$ 8,384
Total other long-term liabilities	$ 61,330	61,330	61,538
Deferred GCI Capacity Revenue [Member]
Deferred revenue, noncurrent		33,184	35,255
Deferred IRU Capacity Revenue [Member]
Deferred revenue, noncurrent		19,366	15,697
Other Deferred Revenue [Member]
Deferred revenue, noncurrent		$ 1,391	$ 2,202

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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