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INVENTORIES - Reserve Rollforward (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jan. 01, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Inventory, Reserve [Roll Forward] |  |  |  |  |
Beginning balance* | $ (89,000) | $ (361,000) | $ (155,000) | $ (347,000) | $ (89,000)
Accrual |  | (78,000) | (70,000) | (139,000) | (225,000)
Reduction due to sold inventory |  | 34,000 | 0 | 81,000 | 89,000
Reserves for excess, obsolete, and slow-moving inventories |  | $ (405,000) | $ (225,000) | $ (405,000) | $ (225,000)
Reduction due to future permanent markdowns | $ 2,464 |  |  |  |

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- Definition Inventory, Reserve + References No definition available. + Details
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Period Type: | duration

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- Definition Inventory Valuation Reserves, Permanent Markdowns + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Inventory Valuation Reserves, Provision (Accrual) + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Inventory Valuation Reserves, Raw Materials + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Inventory Valuation Reserves, Sales Of Inventory + References No definition available. + Details
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Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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