Plant and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Cost	$ 11,070	$ 11,070
Accumulated depreciation	5,459	5,447
Net	5,611	5,623
Mt Todd, Australia
Property, Plant and Equipment [Line Items]
Cost	5,237	5,237
Accumulated depreciation	5,126	5,114
Net	111	123
Corporate, United States
Property, Plant and Equipment [Line Items]
Cost	333	333
Accumulated depreciation	333	333
Used mill equipment, Canada
Property, Plant and Equipment [Line Items]
Cost	5,500	5,500
Net	$ 5,500	$ 5,500