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Note 3 - Discontinued Operations (Details) (USD $) | Mar. 31, 2015 | Mar. 31, 2014 | Nov. 26, 2013
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Note 3 - Discontinued Operations (Details) [Line Items] |  |  |
Escrow Deposit | $ 300,000us-gaap_EscrowDeposit | $ 400,000us-gaap_EscrowDeposit |
Uncertainty on the Collection of Escrow [Member] | Pool and Commercial Products [Member] |  |  |
Note 3 - Discontinued Operations (Details) [Line Items] |  |  |
Escrow Deposit | 300,000us-gaap_EscrowDeposit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = efoi_PoolAndCommercialProductsMember / us-gaap_StatementScenarioAxis = efoi_UncertaintyOnTheCollectionOfEscrowMember |  |
Pool and Commercial Products [Member] |  |  |
Note 3 - Discontinued Operations (Details) [Line Items] |  |  |
Disposal Group, Including Discontinued Operation, Consideration |  |  | 5,200,000us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = efoi_PoolAndCommercialProductsMember
Escrow Deposit |  |  | $ 500,000us-gaap_EscrowDeposit / us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis = efoi_PoolAndCommercialProductsMember

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- Details
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Namespace Prefix: | efoi_
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- Definition Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation. + References No definition available. + Details
Name: | us-gaap_DisposalGroupIncludingDiscontinuedOperationConsideration
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The designation of funds furnished by a borrower to a lender to assure future payments of the borrower's real estate taxes and insurance obligations with respect to a mortgaged property. Escrow deposits may be made for a variety of other purposes such as earnest money and contingent payments. This element excludes replacement reserves which are an escrow separately provided for within the US GAAP taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Balance Type: |
Period Type: |