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3. CONTRACT ACCOUNTING AND ACCOUNTS RECEIVABLE (Details-Billings in Excess of Cost) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Costs in Excess of Billings on Uncompleted Contracts or Programs [Abstract]    
Costs and estimated earnings recognized $ 882,716us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedAfterOneYear $ 0us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrProgramsExpectedToBeCollectedAfterOneYear
Less: Billings or cash received (790,050)evsi_CostsAndEstimatedEarningsBillingsOrCashReceived 0evsi_CostsAndEstimatedEarningsBillingsOrCashReceived
Costs and estimated earnings in excess of billings on uncompleted contracts 92,666us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms 0us-gaap_CostsInExcessOfBillingsOnUncompletedContractsOrPrograms
Billings and/or cash receipts on uncompleted contract 15,000us-gaap_BillingsInExcessOfCost 166,334us-gaap_BillingsInExcessOfCost
Less: Revenues recognized (9,386)evsi_RevenuesRecognizedOnUncompletedContracts (3,205)evsi_RevenuesRecognizedOnUncompletedContracts
Billings in excess of costs and estimated earnings on uncompleted contracts $ 5,614us-gaap_BillingsInExcessOfCostCurrent $ 163,129us-gaap_BillingsInExcessOfCostCurrent