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