Note 5 - Geographic Information and Major Customer and Product Data - Summary of Revenues Within Geographical Areas (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Revenues		$ 40,380	$ 30,470
UNITED STATES
Revenues		24,409	17,515
EMEA [Member]
Revenues	[1]	13,241	10,497
Rest of World [Member]
Revenues		$ 2,730	$ 2,458

[1] Sales to customers in the UK accounted for $4,389 of the Company’s revenues for the three months ended March 31, 2017. Sales to customers in France accounted for $3,150 of the Company’s revenues for the three months ended March 31, 2016.