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3. CONTRACT ACCOUNTING AND ACCOUNTS RECEIVABLE (Details Narrative) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Contract Accounting And Accounts Receivable Details Narrative |  |
Bad debt expense (recovery) | $ (14,488) | $ 14,488

X
- Definition Bad debt expense recovery + References No definition available. + Details
Name: | evsi_BadDebtExpenseRecovery
Namespace Prefix: | evsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | evsi_ContractAccountingAndAccountsReceivableDetails2Abstract
Namespace Prefix: | evsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration