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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