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Note 3 - Commitments and Contingent Liabilities (Details) (USD $)
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Note 3 - Commitments and Contingent Liabilities (Details) [Line Items]      
Operating Leases, Rent Expense $ 1,025,000us-gaap_LeaseAndRentalExpense $ 2,986,000us-gaap_LeaseAndRentalExpense  
Promissory Note [Member]      
Note 3 - Commitments and Contingent Liabilities (Details) [Line Items]      
Line of Credit Facility, Maximum Borrowing Capacity     7,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= vrns_PromissoryNoteMember
Debt Instrument, Basis Spread on Variable Rate 0.15%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_LongtermDebtTypeAxis
= vrns_PromissoryNoteMember
   
Line of Credit Facility, Interest Rate at Period End 3.10%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_LongtermDebtTypeAxis
= vrns_PromissoryNoteMember
   
Long-term Line of Credit $ 0us-gaap_LineOfCredit
/ us-gaap_LongtermDebtTypeAxis
= vrns_PromissoryNoteMember