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Basis of Presentation and Summary of Significant Accounting Policies - Product Warranties (Details) | 6 Months Ended
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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

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- Definition Standard Product Warranty, Number of Years + References No definition available. + Details
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Namespace Prefix: | efoi_
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Balance Type: | na
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- 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_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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