XML 51 R41.htm IDEA: XBRL DOCUMENT
v3.21.2

Inventories - Reserve Rollforward (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Inventory, Reserve [Roll Forward] |  |  |  |  |
Beginning balance | $ (2,956) | $ (3,326) | $ (2,894) | $ (2,894) | $ (3,645)
Accrual | 34 | (187) |  | (64) | (75)
Reduction due to sold inventory | 36 | 121 |  | 72 | 288
Write-off for disposed inventory | 0 | (23) | 17 | 0 |
Reserves for excess, obsolete, and slow-moving inventories | $ (2,886) | $ (3,415) | $ (2,956) | $ (2,886) | $ (3,415)

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

X
- 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

X
- 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

X
- 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

X
- 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