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Plant And Equipment (Details)
$ in Thousands
 24 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Property, Plant and Equipment [Line Items]    
Cost $ 12,501 $ 12,537
Accumulated depreciation and write downs 4,288 3,745
Net 8,213 8,792
Mt Todd, Australia [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,654 5,617
Accumulated depreciation and write downs 3,944 3,346
Net 1,710 2,271
Guadalupe De Los Reyes, Mexico [Member]    
Property, Plant and Equipment [Line Items]    
Cost 14 17
Accumulated depreciation and write downs 11 9
Net 3 8
Corporate, United States [Member]    
Property, Plant and Equipment [Line Items]    
Cost 333 403
Accumulated depreciation and write downs 333 390
Net   13
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