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Condensed Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Condensed Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 899,318 $ 942,277
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Net asset value per share $ 108.79 $ 117.46
Common stock, shares issued 7,650,000 7,800,000
Common stock, shares outstanding 7,650,000 7,800,000