Note 5 - Summary of Revenues within Geographical Areas (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
UNITED STATES
Revenues		$ 24,330	$ 18,072	$ 41,845	$ 31,178
EMEA [Member]
Revenues	[1]	11,857	9,240	22,354	17,233
Rest of World [Member]
Revenues		2,454	1,838	4,912	3,725
Revenues		$ 38,641	$ 29,150	$ 69,111	$ 52,136

[1] Sales to customers in France accounted for $6,922 for the six months ended June 30, 2016. During the six months ended June 30, 2015, sales in France did not exceed 10% of the Company’s revenues.