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v2.4.1.9

Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2015 | Dec. 31, 2014
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in Shares) | 3.0us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |
Customer 1 [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  | 82.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = efoi_CustomerOneMember |
Customer 1 [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  | 78.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = efoi_CustomerOneMember |
Customer 1 and 2 [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage | 34.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = efoi_CustomerOneandTwoMember |  |
Customer 1, 2 and 3 [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Concentration Risk, Percentage |  |  | 79.00%us-gaap_ConcentrationRiskPercentage1 / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember / us-gaap_MajorCustomersAxis = efoi_CustomerOneTwoAndThreeMember
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Number of Customers | 2efoi_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 1efoi_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_SalesRevenueNetMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Number of Customers |  | 1efoi_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember | 3efoi_NumberOfCustomers / us-gaap_ConcentrationRiskByBenchmarkAxis = us-gaap_AccountsReceivableMember / us-gaap_ConcentrationRiskByTypeAxis = us-gaap_CustomerConcentrationRiskMember
Minimum [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Standard Product Warranty Term |  | 1 year |
Maximum [Member] |  |  |
Note 2 - Basis of Presentation and Summary of Significant Accounting Policies (Details) [Line Items] |  |  |
Standard Product Warranty Term |  | 5 years |

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