Note 5 - Geographic Information and Major Customer and Product Data - Summary of Revenues within Geographical Areas (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
UNITED STATES
Revenues	$ 17,716	$ 15,080	$ 48,894	$ 38,964
EMEA [Member]
Revenues	10,984	8,543	28,217	23,091
Rest of World [Member]
Revenues	2,537	1,940	6,262	5,579
Revenues	$ 31,237	$ 25,563	$ 83,373	$ 67,634

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