Note 5 - Geographic Information and Major Customer and Product Data (Details) - Summary of Revenues within Geographical Areas (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014
Revenues based on customer’s location:
Revenues	$ 22,986		$ 17,455
UNITED STATES
Revenues based on customer’s location:
Revenues	13,106		9,070
EMEA [Member]
Revenues based on customer’s location:
Revenues	7,993	[1]	6,943	[1]
Rest of the World [Member]
Revenues based on customer’s location:
Revenues	$ 1,887		$ 1,442

[1] Sales to customers in France accounted for $2,318 for the three months ended March 31, 2015. Sales to customers in the UK accounted for$1,880 for the three months ended March 31, 2014.