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Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Cost $ 5,697 $ 5,697
Accumulated depreciation 5,514 5,504
Net 183 193
Mt Todd, Australia    
Property, Plant and Equipment [Line Items]    
Cost 5,364 5,364
Accumulated depreciation 5,181 5,171
Net 183 193
Corporate, United States    
Property, Plant and Equipment [Line Items]    
Cost 333 333
Accumulated depreciation 333 333
Net 0 0
Used mill equipment, Canada    
Property, Plant and Equipment [Line Items]    
Cost 0 0
Accumulated depreciation 0 0
Net $ 0 $ 0