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Other Assets (Details Narrative) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Exploration-related equipment at Lik project $ 100  
Depreciation expense on equipment 10  
Gain on derivative instruments $ 216 $ 629