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Plant And Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Cost	$ 12,524	$ 12,479
Accumulated depreciation	5,164	4,924
Net	7,360	7,555
Mt Todd, Australia [Member]
Property, Plant and Equipment [Line Items]
Cost	5,691	5,646
Accumulated depreciation	4,831	4,591
Net	860	1,055
Corporate, United States [Member]
Property, Plant and Equipment [Line Items]
Cost	333	333
Accumulated depreciation	333	333
Used mill equipment, Canada [Member]
Property, Plant and Equipment [Line Items]
Cost	6,500	6,500
Net	$ 6,500	$ 6,500

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
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-Publisher FASB
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.14)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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+ References

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-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(13))
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-Name Accounting Standards Codification
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