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Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets [Line Items]    
Long-lived assets, net $ 539us-gaap_NoncurrentAssets $ 479us-gaap_NoncurrentAssets
UNITED STATES    
Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets [Line Items]    
Long-lived assets, net 520us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US		 456us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= country_US
International [Member]    
Note 8 - Geographic Information (Details) - Summary of Geographic Long-Lived Assets [Line Items]    
Long-lived assets, net $ 19us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= efoi_InternationalMember		 $ 23us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= efoi_InternationalMember