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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Statements of Assets and Liabilities [Abstract]    
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Investment in gold at cost $ 886,514 $ 942,277
Net asset value per share $ 103.64 $ 117.46
Common stock, shares issued 7,350,000 7,800,000
Common stock, shares outstanding 7,350,000 7,800,000