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INVENTORIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Inventory Disclosure [Abstract]
Impairment loss	$ 1,640	$ 14,350

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- Definition

Impairment Loss Related to Concentrations and Work-in-Progress Inventory

+ References

No definition available.

+ Details

Name:	efr_ImpairmentLossRelatedtoConcentrationsandWorkinProgressInventory
Namespace Prefix:	efr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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