XML 59 R41.htm IDEA: XBRL DOCUMENT v2.4.1.9
Note 9 - Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Note 9 - Income Taxes (Details) [Line Items]  
Operating Loss Carryforwards $ 75.4us-gaap_OperatingLossCarryforwards
Available After IRC Section 382 Limitations [Member]  
Note 9 - Income Taxes (Details) [Line Items]  
Operating Loss Carryforwards 23.9us-gaap_OperatingLossCarryforwards
/ us-gaap_StatementScenarioAxis
= efoi_AvailableAfterIRCSection382LimitationsMember
Foreign Tax Authority [Member] | Her Majesty's Revenue and Customs (HMRC) [Member]  
Note 9 - Income Taxes (Details) [Line Items]  
Operating Loss Carryforwards $ 1.6us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_ForeignCountryMember
/ us-gaap_IncomeTaxAuthorityNameAxis
= us-gaap_HerMajestysRevenueAndCustomsHMRCMember