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Plant And Equipment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]    
Cost $ 12,479 $ 12,501
Accumulated depreciation 4,924 4,288
Net 7,555 8,213
Mt Todd, Australia [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,646 5,654
Accumulated depreciation 4,591 3,944
Net 1,055 1,710
Guadalupe De Los Reyes, Mexico [Member]    
Property, Plant and Equipment [Line Items]    
Cost   14
Accumulated depreciation   11
Net   3
Corporate, United States [Member]    
Property, Plant and Equipment [Line Items]    
Cost 333 333
Accumulated depreciation 333 333
Used mill equipment, Canada [Member]    
Property, Plant and Equipment [Line Items]    
Cost 6,500 6,500
Net $ 6,500 $ 6,500
Number of months to be considered held-for-sale | item 12