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CAPITAL STOCK - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019
Class of Warrant or Right [Line Items]
Warrant issued (in shares)		2,328,925
At The Market Sale Of Stock
Class of Warrant or Right [Line Items]
Sale of stock, number of shares issued (in shares)	5,514,826
Sale of stock, consideration received	$ 14,700

X

- Definition

Class of Warrant or Right, Issued

+ References

No definition available.

+ Details

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Namespace Prefix:	efr_
Data Type:	xbrli:sharesItemType
Balance Type:	na
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_ClassOfWarrantOrRightLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=efr_AtTheMarketSaleOfStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: