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DEBT - Advanced Capital Contribution (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
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Debt Disclosure [Abstract] |  |
Advanced capital contribution | $ 0 | $ 450

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- Definition Advanced Capital Contribution, Current + References No definition available. + Details
Name: | efoi_AdvancedCapitalContributionCurrent
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration