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Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets (USD $) In Thousands, unless otherwise specified | Mar. 31, 2015 | Dec. 31, 2014
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Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets [Line Items] |  |
Long-lived assets, net | $ 539us-gaap_NoncurrentAssets | $ 479us-gaap_NoncurrentAssets
UNITED STATES |  |
Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets [Line Items] |  |
Long-lived assets, net | 520us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US | 456us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = country_US
International [Member] |  |
Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets [Line Items] |  |
Long-lived assets, net | $ 19us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = efoi_InternationalMember | $ 23us-gaap_NoncurrentAssets / us-gaap_StatementGeographicalAxis = efoi_InternationalMember

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- Definition Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51669610&loc=d3e9038-108599 + Details
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