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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Investment in gold at cost $ 2,242,639 $ 2,116,745
Common stock, shares authorized Unlimited Unlimited
Common stock, par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 144,300,000 140,600,000
Common stock, shares outstanding 144,300,000 140,600,000
Net asset value per share (in dollars per share) $ 17.89 $ 17.37