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Income Tax (Sources of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Income/(loss) from continuing operations before income taxes	$ 1,011	$ (18,926)
U.S. [Member]
Income/(loss) from continuing operations before income taxes	(3,297)	(6,705)
Canada [Member]
Income/(loss) from continuing operations before income taxes	(121)	(7,750)
Other Foreign [Member]
Income/(loss) from continuing operations before income taxes	$ 4,429	$ (4,471)

X

- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_StatementGeographicalAxis=country_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementGeographicalAxis=vgz_OtherForeignMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: