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Note 11 - Related Party Transactions (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014
Note 11 - Related Party Transactions (Details) [Line Items] |  |  |
Prepaid Expense and Other Assets, Current | 991us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | $ 1,002us-gaap_PrepaidExpenseAndOtherAssetsCurrent
5 Elements Efficienties (BVI) Ltd [Member] | Communal [Member] | Yeh-Mei Cheng [Member] |  |  |
Note 11 - Related Party Transactions (Details) [Line Items] |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 50.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / dei_LegalEntityAxis = efoi_YehMeiChengMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = efoi_CommunalMember / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = efoi_FiveElementsEfficientiesBVILtdMember |  |
5 Elements Efficienties (BVI) Ltd [Member] |  |  |
Note 11 - Related Party Transactions (Details) [Line Items] |  |  |
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest | 50.00%us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = efoi_FiveElementsEfficientiesBVILtdMember |  |
Communal [Member] | Prepaid Expenses and Other Current Assets [Member] |  |  |
Note 11 - Related Party Transactions (Details) [Line Items] |  |  |
Prepaid Expense and Other Assets, Current | 170us-gaap_PrepaidExpenseAndOtherAssetsCurrent / us-gaap_BalanceSheetLocationAxis = us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = efoi_CommunalMember |  |
Communal [Member] |  |  |
Note 11 - Related Party Transactions (Details) [Line Items] |  |  |
Related Party Transaction, Term of Agreement | 60 months |  |
Commission Fee, Percent | 5.00%efoi_CommissionFeePercent / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = efoi_CommunalMember |  |
Payments for Commissions | 0us-gaap_PaymentsForCommissions / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = efoi_CommunalMember |  |
Related Party Transaction, Expenses from Transactions with Related Party | 56us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = efoi_CommunalMember | $ 56us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = efoi_CommunalMember |

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- Definition The percentage of net sales that must be paid as commission fees. + References No definition available. + Details
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- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
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- Definition The amount of cash paid for commissions during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585 + Details
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- Definition Amount of asset related to consideration paid in advance for costs that provide economic benefits in future periods, and amount of other assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 8 -Article 5 + Details
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- Definition Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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