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Note 12 - Commitments and Contingencies (Details) (Selling, General and Administrative Expenses [Member], Merl Toyer v. Energy Focus, Inc [Member], USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015
Selling, General and Administrative Expenses [Member] | Merl Toyer v. Energy Focus, Inc [Member] |
Note 12 - Commitments and Contingencies (Details) [Line Items] |
Loss Contingency, Loss in Period | $ 240us-gaap_LossContingencyLossInPeriod / us-gaap_IncomeStatementLocationAxis = us-gaap_SellingGeneralAndAdministrativeExpensesMember / us-gaap_LitigationCaseAxis = efoi_MerlToyerVEnergyFocusIncMember

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- Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of loss pertaining to the specified contingency that was charged against earnings in the period, including the effects of revisions in previously reported estimates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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Period Type: | duration