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2. GOING CONCERN (Details Narrative) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Going Concern
Net losses	$ (3,146,302)us-gaap_NetIncomeLoss	$ (2,793,910)us-gaap_NetIncomeLoss
Stock based compensation expense	736,388us-gaap_AllocatedShareBasedCompensationExpense	557,967us-gaap_AllocatedShareBasedCompensationExpense
Net cash used in operations	(1,817,122)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	(1,591,667)us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Working capital	(873,149)evsi_WorkingCapital
Accumulated deficit	(30,762,400)us-gaap_RetainedEarningsAccumulatedDeficit	(27,616,098)us-gaap_RetainedEarningsAccumulatedDeficit
Stockholders' deficit	(582,799)us-gaap_StockholdersEquity	(2,505,874)us-gaap_StockholdersEquity	(2,048,096)us-gaap_StockholdersEquity
Proceeds from offering	$ 3,028,010us-gaap_ProceedsFromIssuanceOrSaleOfEquity

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