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Plant And Equipment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
USD ($)
item
Dec. 31, 2014
USD ($)
item
Property, Plant and Equipment [Line Items]    
Cost $ 12,537 $ 12,403
Accumulated depreciation and write downs 3,745 3,061
Net 8,792 9,342
Mt Todd Australia [Member]    
Property, Plant and Equipment [Line Items]    
Cost 5,617 5,483
Accumulated depreciation and write downs 3,346 2,756
Net 2,271 2,727
Guadalupe De Los Reyes Mexico [Member]    
Property, Plant and Equipment [Line Items]    
Cost 17 17
Accumulated depreciation and write downs 9 8
Net 8 9
Corporate United States [Member]    
Property, Plant and Equipment [Line Items]    
Cost 403 403
Accumulated depreciation and write downs 390 297
Net 13 106
Used mill equipment [Member]    
Property, Plant and Equipment [Line Items]    
Cost 6,500 6,500
Net 6,500 6,500
Value of equipment $ 6,500 $ 6,500
Number of months to be considered held-for-sale | item 12 12