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Note 5 - Geographic Information and Major Customer and Product Data (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Note 5 - Geographic Information and Major Customer and Product Data (Details) [Line Items]    
Number of Reportable Segments 1us-gaap_NumberOfReportableSegments  
Revenues $ 22,986us-gaap_Revenues $ 17,455us-gaap_Revenues
CDW Logistics [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]    
Note 5 - Geographic Information and Major Customer and Product Data (Details) [Line Items]    
Concentration Risk, Percentage   11.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= vrns_CDWLogisticsMember
FRANCE    
Note 5 - Geographic Information and Major Customer and Product Data (Details) [Line Items]    
Revenues 2,318us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_FR		  
UNITED KINGDOM    
Note 5 - Geographic Information and Major Customer and Product Data (Details) [Line Items]    
Revenues   $ 1,880us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_GB