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Inventories - Reserve Rollforward (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Inventory, Reserve [Roll Forward] |  |
Beginning balance | $ (3,518) | $ (4,085)
Accrual | 281 | (814)
Reduction due to sold inventory | 343 | 845
Write-off for disposed inventory | 0 | 536
Reserves for excess, obsolete, and slow-moving inventories | $ (2,894) | $ (3,518)

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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

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- Definition Inventory Valuation Reserves, Write-Offs + References No definition available. + Details
Name: | efoi_InventoryValuationReservesWriteOffs
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration