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Organization and Summary of Significant Accounting Policies - Asset Retirement Obligation (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Asset retirement obligations $ 3,721vyey_ResultsOfOperationsAccretionOfAssetRetirementObligation $ 8,930vyey_ResultsOfOperationsAccretionOfAssetRetirementObligation
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Asset retirement obligation at beginning of period 51,954us-gaap_AssetRetirementObligation 39,905us-gaap_AssetRetirementObligation
Liabilities incurred   8,930us-gaap_AssetRetirementObligationLiabilitiesIncurred
Revisions to previous estimates and sales of properties (14,821)us-gaap_AssetRetirementObligationRevisionOfEstimate 0us-gaap_AssetRetirementObligationRevisionOfEstimate
Accretion expense 3,360us-gaap_AssetRetirementObligationAccretionExpense 3,119us-gaap_AssetRetirementObligationAccretionExpense
Asset retirement obligation at end of period $ 44,214us-gaap_AssetRetirementObligation $ 51,954us-gaap_AssetRetirementObligation