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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 974,991 $ 886,514
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Net asset value per share $ 128.61 $ 103.64
Common stock, shares issued 8,300,000 7,350,000
Common stock, shares outstanding 8,300,000 7,350,000