XML 55 R44.htm IDEA: XBRL DOCUMENT v3.19.1

13. REVENUES (Details Narrative) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Deferred revenue	$ 904,107	$ 835,785
Product Deposits [Member]
Deferred revenue	862,365
Maintenance Fees [Member]
Deferred revenue	$ 41,742

X

- Definition

Amount of deferred income and obligation to transfer product and service to customer for which consideration has been received or is receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(5))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DeferredRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=evsi_ProductDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DeferredRevenueArrangementTypeAxis=evsi_MaintenanceFeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: