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SEGMENT INFORMATION (Narrative) (Details)	6 Months Ended
	Jun. 30, 2016
Operations whose revenues, earnings or losses or assets exceed total consolidated revenue	10.00%

X

- Definition

Operations whose revenues, earnings or losses or assets exceed total consolidated revenue

+ References

No definition available.

+ Details

Name:	efr_OperationsWhoseRevenuesEarningsOrLossesOrAssetsExceedTotalConsolidatedRevenue
Namespace Prefix:	efr_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration