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Condensed Statements of Assets and Liabilities (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Condensed Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 924,736us-gaap_InvestmentOwnedAtCost $ 942,277us-gaap_InvestmentOwnedAtCost
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Net asset value per share $ 116.15sgol_NetAssetValuePerShare $ 117.46sgol_NetAssetValuePerShare
Common stock, shares issued 7,900,000us-gaap_CommonStockSharesIssued 7,800,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 7,900,000us-gaap_CommonStockSharesOutstanding 7,800,000us-gaap_CommonStockSharesOutstanding