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v3.4.0.3

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