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Schedule of Compensation Costs for Share-based Payment Arrangements (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share-based compensation	$ 667	$ 125

X

- Definition

Share-based compensation

+ References

No definition available.

+ Details

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