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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 821,324 $ 786,969
Common stock, shares authorized Unlimited Unlimited
Common stock, par value
Common stock, shares issued 6,900,000 6,850,000
Common stock, shares outstanding 6,900,000 6,850,000
Net asset value per share $ 135.78 $ 123.61