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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Statements of Assets and Liabilities [Abstract]    
Investment in gold at cost $ 786,969 $ 983,748
Common stock, shares authorized Unlimited Unlimited
Common stock, par value
Common stock, shares issued 6,850,000 8,350,000
Common stock, shares outstanding 6,850,000 8,350,000
Net asset value per share $ 123.61 $ 125.51