Note 7 - Fair Value Measurements - Schedule of Carrying Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Apr. 02, 2015
IRU Assets			$ 2,304
IRU Obligations			$ 4,153
Reported Value Measurement [Member]
IRU Assets	$ 1,964	$ 2,041
IRU Obligations	$ 3,441	$ 3,594