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Note 7 - Debt (Details) (USD $) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Dec. 22, 2011 | Mar. 31, 2015 | Dec. 31, 2014
Note 7 - Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) | $ 4,500,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Line of Credit Facility Available Percentage of Receivables | 85.00%efoi_LineOfCreditFacilityAvailablePercentageOfReceivables |  |
Line of Credit Facility, Commitment Fee Percentage | 1.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage |  |
UNITED KINGDOM | Subsidiaries [Member] | Line of Credit [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Long-term Line of Credit (in Dollars) |  |  | 0us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_GB
Line of Credit Facility, Available Percent of Eligible Sales |  | 80.00%efoi_LineOfCreditFacilityAvailablePercentOfEligibleSales / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_GB |
Debt Instrument, Interest Rate, Stated Percentage |  | 3.02%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_StatementGeographicalAxis = country_GB |
Unsecured Promissory Note - Quercus Trust [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 1.00%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = efoi_UnsecuredPromissoryNoteQuercusTrustMember |
Percentage of Inventory, Lower of Cost or Market Value [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Line of Credit Facility Available Threshold Percent | 50.00%efoi_LineOfCreditFacilityAvailableThresholdPercent / us-gaap_CreditFacilityAxis = efoi_PercentageOfInventoryLowerOfCostOrMarketValueMember |  |
Inventory, Maximum Value [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Line of Credit Facility Available Threshold Value (in Dollars) | 250,000efoi_LineOfCreditFacilityAvailableThresholdValue / us-gaap_CreditFacilityAxis = efoi_InventoryMaximumValueMember |  |
Borrowing on Accounts Receivable [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 8.50%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = efoi_BorrowingOnAccountsReceivableMember |  |
Borrowing on Inventories [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 10.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = efoi_BorrowingOnInventoriesMember |  |
Borrowing on Overdrafts [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Line of Credit Facility, Interest Rate During Period | 13.00%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod / us-gaap_CreditFacilityAxis = efoi_BorrowingOnOverdraftsMember |  |
Revolving Credit Facility [Member] |  |  |
Note 7 - Debt (Details) [Line Items] |  |  |
Long-term Line of Credit (in Dollars) |  | 1,700,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember | 453,000us-gaap_LineOfCredit / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) |  | $ 708,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |

X
- Definition The percentage of eligible receivables which determines the amount of line of credit available. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition The percentage of eligible sales which determine the amount of line of credit available. + References No definition available. + Details
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X
- Definition The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value. + References No definition available. + Details
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Namespace Prefix: | efoi_
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X
- Definition The threshold for determining the available line of credit with regards to the lessor of the percentage of lower of cost or market value of inventory or a predetermined value. + References No definition available. + Details
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X
- Details
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X
- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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X
- Definition The effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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