Debt - Credit Facilities (Details)	Dec. 22, 2011 USD ($)
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity	$ 4,500,000.0
Credit facility, available percentage of receivables	85.00%
Stated interest rate	1.00%
Percentage of inventory, lower of cost or market value
Debt Instrument [Line Items]
Credit facility, available threshold, percent	50.00%
Inventory, maximum value
Debt Instrument [Line Items]
Credit facility, available threshold	$ 250,000
Borrowing on accounts receivable
Debt Instrument [Line Items]
Credit facility, interest rate	8.50%
Borrowing on inventories
Debt Instrument [Line Items]
Credit facility, interest rate	10.00%
Borrowing on overdrafts
Debt Instrument [Line Items]
Credit facility, interest rate	13.00%
Right to terminate, notice required, period of time	60 days

The percentage of eligible receivables which determines the amount of line of credit available.

No definition available.

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Namespace Prefix:	efoi_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value.

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
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Balance Type:	na
Period Type:	instant

- Definition

The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value.

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Right to Terminate, Notice Required, Period of Time

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
Data Type:	xbrli:durationItemType
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Period Type:	duration

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- 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

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

- Definition

The effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

- Details

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Namespace Prefix:
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Balance Type:
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- Details

Name:	us-gaap_CreditFacilityAxis=efoi_InventoryMaximumValueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=efoi_BorrowingOnAccountsReceivableMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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Namespace Prefix:
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Balance Type:
Period Type: