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DEBT - Advanced Capital Contribution (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
Advanced capital contribution	$ 0	$ 450

X

- 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

X

- References

No definition available.

+ Details

Name:	us-gaap_DebtDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration