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v3.22.1

SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) $ in Thousands | Mar. 31, 2022 USD ($)
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Related Party Transaction [Line Items] |
Other receivables | $ 1,990
Consolidated Uranium Inc. |
Related Party Transaction [Line Items] |
Other receivables | $ 1,900

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=efr_ConsolidatedUraniumIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |