XML 94 R81.htm IDEA: XBRL DOCUMENT
v3.21.1

Related Party Transactions (Details) - USD ($) $ in Thousands | Mar. 29, 2019 | Jul. 31, 2014 | Dec. 31, 2020 | Feb. 26, 2019
--- | --- | --- | --- | ---
5 Elements Global Advisors |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership in reporting entity by related party |  |  | 1.70% |
5 Elements Energy Efficiencies (BVI) Ltd. |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership in reporting entity by related party |  |  | 1.60% |
5 Elements Efficiencies (BVI) Ltd. | Yeh-Mei Cheng | Communal International Ltd. |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |
13D Group |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership in reporting entity by related party |  |  |  | 17.60%
Amount invested | $ 1,700 |  |  |
13D Group | James Tu Through Fusion Park LLC |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount invested | 580 |  |  |
13D Group | Brilliant Start Enterprise, Inc. |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Amount invested | $ 500 |  |  |
Communal |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership in reporting entity by related party |  | 5.00% |  |
Communal | 5 Elements Efficiencies (BVI) Ltd. | Communal International Ltd. |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Ownership interest |  | 50.00% |  |

X
- Definition Related Party Transactions, Ownership in Reporting Entity by Related Party + References No definition available. + Details
Name: | efoi_RelatedPartyTransactionsOwnershipinReportingEntitybyRelatedParty
Namespace Prefix: | efoi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Percentage investment held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055 + Details
Name: | us-gaap_LimitedLiabilityCompanyLLCOrLimitedPartnershipLPManagingMemberOrGeneralPartnerOwnershipInterest
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of transactions with related party during the financial reporting period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39603-107864 + Details
Name: | us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=efoi_A5ElementsGlobalAdvisorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=efoi_A5ElementsEnergyEfficienciesBVILtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=efoi_FiveElementsEfficientiesBVILtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=efoi_YehMeiChengMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_OwnershipAxis=efoi_CommunalInternationalLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=efoi_A13DGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=efoi_JamesTuThroughFusionParkLLCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=efoi_BrilliantStartEnterpriseInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=efoi_CommunalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |