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

X
- Details
Name: | efoi_Note9IncomeTaxesDetailsLineItems
Namespace Prefix: | efoi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
Name: | us-gaap_OperatingLossCarryforwards
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=efoi_AvailableAfterIRCSection382LimitationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |