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Inventories - Reserve Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Inventory, Reserve [Roll Forward] |  |
Beginning balance | $ (2,527) | $ (3,050)
Accrual | (56) | (145)
Reduction due to sold inventory | 76 | 16
Reserves for excess, obsolete, and slow-moving inventories | $ (2,507) | $ (3,179)

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- Definition Inventory, Reserve + References No definition available. + Details
Name: | efoi_InventoryReserveRollForward
Namespace Prefix: | efoi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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