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Note 8 - Geographic Information (Details) - Summary of Geographic Sales (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Note 8 - Geographic Information (Details) - Summary of Geographic Sales [Line Items] |  |
Net Sales | $ 13,145us-gaap_SalesRevenueNet | $ 4,919us-gaap_SalesRevenueNet
UNITED STATES |  |
Note 8 - Geographic Information (Details) - Summary of Geographic Sales [Line Items] |  |
Net Sales | 12,603us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US | 4,283us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
International [Member] |  |
Note 8 - Geographic Information (Details) - Summary of Geographic Sales [Line Items] |  |
Net Sales | $ 542us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = efoi_InternationalMember | $ 636us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = efoi_InternationalMember

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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 + Details
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