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Plant and Equipment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Cost $ 5,769 $ 5,718
Accumulated depreciation 5,526 5,514
Net 243 204
Gain on sale of plant and equipment, net 802  
Proceeds from sale of plant and equipment 900  
Mt Todd, Australia    
Property, Plant and Equipment [Line Items]    
Cost 5,466 5,415
Accumulated depreciation 5,223 5,211
Net 243 204
Corporate, United States    
Property, Plant and Equipment [Line Items]    
Cost 303 303
Accumulated depreciation 303 303
Net 0 0
Used mill equipment, Canada    
Property, Plant and Equipment [Line Items]    
Cost 0 0
Accumulated depreciation 0 0
Net 0 $ 0
Gain on sale of plant and equipment, net 802  
Proceeds from sale of plant and equipment 900  
Selling costs of plant and equipment $ 98