Note 9 - Other Long-term Liabilities - Summary of Other Long-term Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Other	$ 8,907	$ 8,869
Total other long-term liabilities	67,469	67,827
GCI [Member]
Deferred revenue, noncurrent	30,596	31,113
IRU [Member]
Deferred revenue, noncurrent	25,144	25,732
Service, Other [Member]
Deferred revenue, noncurrent	$ 2,822	$ 2,113