Note 7 - Customer and Geographic Information - Long-lived Assets by Geographic Area (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
UNITED STATES
Long-lived assets	$ 15,559	$ 10,752
Rest of the World [Member]
Long-lived assets	517	573
Long-lived assets	$ 16,076	$ 11,325