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Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	Feb. 25, 2015
Subsequent Event [Member]
Subsequent Event [Line Items]
Operating lease term	15efsi_OperatingLeaseTerm / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Lease commitment	$ 3.3us-gaap_OtherCommitment / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember

X

- Definition

Operating Lease Term

+ References

No definition available.

+ Details

Name:	efsi_OperatingLeaseTerm
Namespace Prefix:	efsi_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Minimum amount of other commitment not otherwise specified in the taxonomy. Excludes commitments explicitly modeled in the taxonomy, including but not limited to, long-term and short-term purchase commitments, recorded and unrecorded purchase obligations, supply commitments, registration payment arrangements, leases, debt, product warranties, guarantees, environmental remediation obligations, and pensions.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration