Note 9 - Other Long-term Liabilities - Summary of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Other	$ 9,591	$ 8,869
Total other long-term liabilities	66,815	67,827
GCI [Member]
Deferred revenue, noncurrent	30,080	31,113
IRU [Member]
Deferred revenue, noncurrent	24,554	25,732
Service, Other [Member]
Deferred revenue, noncurrent	$ 2,590	$ 2,113