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

X

- 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

X

- 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

Name:	us-gaap_RelatedPartyTransactionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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