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RECEIVABLES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024
Receivables [Abstract] |  |  |
Trade receivables | $ 8,035 | $ 8,035 | $ 29,019
Tax receivables | 3,636 | 3,636 | 8,744
Other | 390 | 390 | 0
Receivables, Net | 12,061 | 12,061 | $ 37,763
Value-added tax expense | $ 3,420 | $ 3,420 |

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- Definition Nontrade Receivables, Allowance For Credit Loss, Current, Period Increase (Decrease) + References No definition available. + Details
Name: | efr_NontradeReceivablesAllowanceForCreditLossCurrentPeriodIncreaseDecrease
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Other Receivables, After Allowance For Credit Loss, Current + References No definition available. + Details
Name: | efr_OtherReceivablesAfterAllowanceForCreditLossCurrent
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Receivables, Net + References No definition available. + Details
Name: | efr_ReceivablesNet
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Trade Receivables, After Allowance For Credit Loss, Current + References No definition available. + Details
Name: | efr_TradeReceivablesAfterAllowanceForCreditLossCurrent
Namespace Prefix: | efr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The sum of amounts currently receivable other than from customers. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_NontradeReceivablesCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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