Note 8 - Other Long-term Liabilities - Summary of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other	$ 7,955	$ 7,389
Total other long-term liabilities	64,256	61,330
Deferred GCI Capacity Revenue [Member]
Deferred revenue, noncurrent	32,156	33,184
Deferred IRU Capacity Revenue [Member]
Deferred revenue, noncurrent	22,298	19,366
Other Deferred Revenue [Member]
Deferred revenue, noncurrent	$ 1,847	$ 1,391