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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 939,240 $ 886,514
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Net asset value per share $ 120.57 $ 103.64
Common stock, shares issued 8,000,000 7,350,000
Common stock, shares outstanding 8,000,000 7,350,000