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, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
UNITED STATES
Revenues	$ 18,072	$ 14,814	$ 31,178	$ 23,884
EMEA [Member]
Revenues	9,240	7,605	17,233	14,548
Rest of the World [Member]
Revenues	1,838	2,197	3,725	3,639
Revenues	$ 29,150	$ 24,616	$ 52,136	$ 42,071

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Name:	us-gaap_Revenues
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration