Note 8 - Other Long-term Liabilities - Summary of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Other	$ 7,901	$ 7,389
Total other long-term liabilities	65,109	61,330
Deferred GCI Capacity Revenue [Member]
Deferred revenue, noncurrent	31,635	33,184
Deferred IRU Capacity Revenue [Member]
Deferred revenue, noncurrent	23,629	19,366
Other Deferred Revenue [Member]
Deferred revenue, noncurrent	$ 1,944	$ 1,391