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3. CONTRACT ACCOUNTING AND ACCOUNTS RECEIVABLE (Details Narrative) (USD $)	12 Months Ended
	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

X

- Details

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