Note 5 - Summary of Revenues within Geographical Areas (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2016	Mar. 31, 2015
UNITED STATES
Revenues		$ 17,515	$ 13,106
EMEA [Member]
Revenues	[1]	10,497	7,993
Rest of World [Member]
Revenues		2,458	1,887
Revenues		$ 30,470	$ 22,986

[1] Sales to customers in France accounted for $3,150 and $2,318 for the three months ended March 31, 2016 and 2015, respectively.