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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Investment in gold at cost $ 3,261,352 $ 2,476,303
Common stock, shares authorized Unlimited Unlimited
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 171,100,000 150,700,000
Common stock, shares outstanding 171,100,000 150,700,000
Net asset value per share (in dollars per share) $ 36.47 $ 24.92