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Basis of Presentation and Summary of Significant Accounting Policies - Product Warranties (Details)	6 Months Ended
	Jun. 30, 2022
Minimum | Commercial
Product Warranty Liability [Line Items]
Warranty service periods	5 years
Minimum | MMM LED Products
Product Warranty Liability [Line Items]
Warranty service periods	5 years
Minimum | UVCD Products
Product Warranty Liability [Line Items]
Warranty service periods	1 year
Maximum | Commercial
Product Warranty Liability [Line Items]
Warranty service periods	10 years
Maximum | MMM LED Products
Product Warranty Liability [Line Items]
Warranty service periods	10 years
Maximum | UVCD Products
Product Warranty Liability [Line Items]
Warranty service periods	5 years

X

- Definition

Standard Product Warranty, Number of Years

+ References

No definition available.

+ Details

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Namespace Prefix:	efoi_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=efoi_MMMLEDProductsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: