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11. RELATED PARTY TRANSACTIONS (Details Narrative) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Principal payments of note $ 3,000us-gaap_RepaymentsOfConvertibleDebt $ 3,000us-gaap_RepaymentsOfConvertibleDebt  
Remaining balance of notes 95,616us-gaap_NotesPayableRelatedPartiesClassifiedCurrent   98,616us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
Accrued interest 203,637us-gaap_InterestPayableCurrent   173,437us-gaap_InterestPayableCurrent
Stock issued for services - shares 202,571us-gaap_StockIssuedDuringPeriodSharesIssuedForServices    
Restricted stock issued during period 138,888us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross    
Value of restricted stock issued 20,832us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross    
GreenCore      
Stock issued for services - shares 202,571us-gaap_StockIssuedDuringPeriodSharesIssuedForServices
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_GreenCoreMember
   
Stock issued for services - value 27,000us-gaap_StockIssuedDuringPeriodValueIssuedForServices
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_GreenCoreMember
   
Two Directors      
Restricted stock issued during period 138,888us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_TwoDirectorsMember
   
Value of restricted stock issued 20,832us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_TwoDirectorsMember
   
John Evey      
Principal payments of note 3,000us-gaap_RepaymentsOfConvertibleDebt
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_EveyMember
   
Remaining balance of notes 95,616us-gaap_NotesPayableRelatedPartiesClassifiedCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_EveyMember
   
Accrued interest $ 27,616us-gaap_InterestPayableCurrent
/ us-gaap_RelatedPartyTransactionsByRelatedPartyAxis
= evsi_EveyMember