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Receivable for Claimed Employee Retention Tax Credit (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021
Other Income and Expenses [Abstract] |  |
ERTC refund | $ 431 |
ERTC expected receivable |  | $ 445

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- Definition Payroll Tax Credit, Employee Retention Credit Under The CARES Act + 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 Payroll Tax Credit, Employee Retention Credit Under The CARES Act, Current + References No definition available. + Details
Name: | efoi_PayrollTaxCreditEmployeeRetentionCreditUnderTheCARESActCurrent
Namespace Prefix: | efoi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_OtherIncomeAndExpensesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration