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Note 10 - Shareholders Equity (Detail) - Warrants Outstanding and Exercisable | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Exercise Price (in Dollars per Item) | 0.76 | 1.43 | 1.42 | 1.24
Number of Shares Outstanding | 13,056,378 | 3,256,378 | 3,291,378 | 4,437,639
Number of Shares Exercisable | 12,856,378 |  |  |
Warrants Outstanding [Member] | Exercise Price $0.01 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years 255 days |  |  |
Warrants Outstanding [Member] | Exercise Price $0.49 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years |  |  |
Warrants Outstanding [Member] | Exercise Price $0.54 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years 73 days |  |  |
Warrants Outstanding [Member] | Exercise Price $1.20 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years 73 days |  |  |
Warrants Outstanding [Member] | Exercise Price $1.97 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 73 days |  |  |
Warrants Outstanding [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 3 years 146 days |  |  |
Warrants Exercisable [Member] | Exercise Price $0.01 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years 255 days |  |  |
Warrants Exercisable [Member] | Exercise Price $0.49 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years |  |  |
Warrants Exercisable [Member] | Exercise Price $0.54 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years 73 days |  |  |
Warrants Exercisable [Member] | Exercise Price $1.20 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 2 years 73 days |  |  |
Warrants Exercisable [Member] | Exercise Price $1.97 [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 73 days |  |  |
Warrants Exercisable [Member] |  |  |  |
Weighted Average Remaining Contactual Life | 3 years 146 days |  |  |
Exercise Price $0.01 [Member] |  |  |  |
Exercise Price (in Dollars per Item) | 0.01 |  |  |
Number of Shares Outstanding | 300,000 |  |  |
Number of Shares Exercisable | 300,000 |  |  |
Exercise Price $0.49 [Member] |  |  |  |
Exercise Price (in Dollars per Item) | 0.49 |  |  |
Number of Shares Outstanding | 600,000 |  |  |
Number of Shares Exercisable | 400,000 |  |  |
Exercise Price $0.54 [Member] |  |  |  |
Exercise Price (in Dollars per Item) | 0.54 |  |  |
Number of Shares Outstanding | 9,800,000 |  |  |
Number of Shares Exercisable | 9,800,000 |  |  |
Exercise Price $1.20 [Member] |  |  |  |
Exercise Price (in Dollars per Item) | 1.20 |  |  |
Number of Shares Outstanding | 350,000 |  |  |
Number of Shares Exercisable | 350,000 |  |  |
Exercise Price $1.97 [Member] |  |  |  |
Exercise Price (in Dollars per Item) | 1.97 |  |  |
Number of Shares Outstanding | 2,006,378 |  |  |
Number of Shares Exercisable | 2,006,378 |  |  |

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: | duration

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 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=6881521&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 4 -Article 4 + Details
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Namespace Prefix: | us-gaap_
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X
- Definition Aggregate amount of each class of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6881521&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Article 4 + Details
Name: | us-gaap_ClassOfWarrantOrRightOutstanding
Namespace Prefix: | us-gaap_
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