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Capital Stock (Narrative) (Details) (USD $) | 1 Months Ended | 12 Months Ended
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Dec. 31, 2012 | Aug. 31, 2012 | Jul. 31, 2012 item | Apr. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Proceeds from issuance of common shares | $ 11,500,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 265,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  | $ 1,100,000 us-gaap_ProceedsFromIssuanceOfCommonStock | $ 733,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  | $ 733,000 us-gaap_ProceedsFromIssuanceOfCommonStock
Common shares issued (in shares) |  | 115,217 us-gaap_CommonStockSharesIssued |  | 478,261 us-gaap_CommonStockSharesIssued | 225,000 us-gaap_CommonStockSharesIssued |  |  |
Exercises of compensation options (in shares) |  |  |  |  | 225,000 vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercised |  | 225,000 vgz_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercised |
Warrants Exercised |  | 115,217 vgz_WarrantsExercised |  |  |  |  |  |
Private placement number of units sold |  |  | 5,000,000 vgz_PrivatePlacementNumberOfUnitsSold |  |  |  |  |
Private placement proceeds from sale of units gross |  |  | 15,000,000 vgz_PrivatePlacementProceedsFromSaleOfUnitsGross |  |  |  |  |
Private placement, number of common share in each unit |  |  | 1 vgz_PrivatePlacementNumberOfCommonShareInEachUnit |  |  |  |  |
Private placement, number of common share purchase warrant in each unit |  |  | 0.5 vgz_PrivatePlacementNumberOfCommonSharePurchaseWarrantInEachUnit |  |  |  |  |
Private placement, warrant exercisable period |  |  | 24 months |  |  |  |  |
Public Offering, number of units sold | 4,182,550 vgz_PublicOfferingNumberOfUnitsSold |  |  |  |  |  |  |
Over-allotment option units issued | 545,550 vgz_OverAllotmentOptionUnitsIssued |  |  |  |  |  |  |
Public Offering, number of common shares in each unit | 1 vgz_PublicOfferingNumberOfCommonSharesInEachUnit |  |  |  |  |  |  |
Public Offering, number of common share purchase warrants in each unit | 0.5 vgz_PublicOfferingNumberOfCommonSharePurchaseWarrantsInEachUnit |  |  |  |  |  |  |
Public Offering, warrant exercisable period | 24 months |  |  |  |  |  |  |
Compensation Options Issued to Underwriters |  |  | 166,667 vgz_CompensationOptionsIssuedToUnderwriters |  |  |  |  |
Number of shares placed by brokers |  |  | 3,333,334 vgz_NumberOfSharesPlacedByBrokers |  |  |  |  |
Equity issuance commissions and other costs | $ 1,258,000 vgz_EquityIssuanceCommissionsAndOtherCosts |  | $ 770,000 vgz_EquityIssuanceCommissionsAndOtherCosts |  |  |  |  |
Compensation options exercised, shares |  |  |  |  |  | 125,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 450,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised |
Warrants [Member] |  |  |  |  |  |  |  |
Private placement, warrant exercisable period |  |  | 24 months |  |  |  |  |
Private placement price per common share |  |  | $ 3.60 vgz_PrivatePlacementPricePerCommonShare / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |  |  |  |
Public Offering, price per common share | 3.30 vgz_PublicOfferingPricePerCommonShare / us-gaap_StatementEquityComponentsAxis = us-gaap_WarrantMember |  |  |  |  |  |  |
Compensation Warrants [Member] |  |  |  |  |  |  |  |
Private placement, number of common share in each unit |  |  | 1 vgz_PrivatePlacementNumberOfCommonShareInEachUnit / us-gaap_StatementEquityComponentsAxis = vgz_CompensationWarrantsMember |  |  |  |  |
Private placement price per common share |  |  | $ 3.18 vgz_PrivatePlacementPricePerCommonShare / us-gaap_StatementEquityComponentsAxis = vgz_CompensationWarrantsMember |  |  |  |  |

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