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Stockholders' Equity - Warrants Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2016	Aug. 06, 2014
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)		$ 5.40
Exercise price, range one
Class of Warrant or Right [Line Items]
Exercise Price (in dollars per share)	$ 4.30
Number of Shares Outstanding (in shares)	6,750
Weighted Average Remaining Contractual Life	1 year 26 days
Number of Shares Exercisable (in shares)	0
Weighted Average Exercise Price (in dollars per share)	$ 0.00

X

- Definition

The number of warrants or rights exercisable.

+ References

No definition available.

+ Details

Name:	efoi_ClassOfWarrantOrRightExercisable
Namespace Prefix:	efoi_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average remaining contractual term for warrant or right.

+ References

No definition available.

+ Details

Name:	efoi_ClassOfWarrantOrRightWeightedAverageRemainingContactualTerm
Namespace Prefix:	efoi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The exercise price of each class of warrants or rights exercisable at the end of the period.

+ References

No definition available.

+ Details

Name:	efoi_ClassofWarrantorRightWeightedAverageExercisePrice
Namespace Prefix:	efoi_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

+ Details

Name:	us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: