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Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales [Line Items] |  |
Net Sales | $ 4,919 | $ 4,458
UNITED STATES |  |
Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales [Line Items] |  |
Net Sales | 4,283 | 3,885
International [Member] |  |
Note 9 - Segments and Geographic Information (Details) - Summary of Geographic Sales [Line Items] |  |
Net Sales | $ 636 | $ 573

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- Details
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Namespace Prefix: | efoi_
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Balance Type: | na
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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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Balance Type: | credit
Period Type: | duration