Note 5 - Geographic Information and Major Customer and Product Data - Summary of Revenues Within Geographical Areas (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues		$ 50,174	$ 38,641	$ 90,554	$ 69,111
UNITED STATES
Revenues		33,135	24,330	57,544	41,845
EMEA [Member]
Revenues	[1]	13,879	11,857	27,120	22,354
Rest of World [Member]
Revenues		$ 3,160	$ 2,454	$ 5,890	$ 4,912

[1] Sales to customers in France accounted for $5,153 of the Company’s revenues for the three months ended June 30, 2017 and did not exceed 10% of the Company’s revenues for the three months ended June 30, 2016. Sales to customers in France did not exceed 10% of the Company’s revenues for the six months ended June 30, 2017 and accounted for $6,922 of the Company’s revenues for the six months ended June 30, 2016.