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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Statement of Financial Position [Abstract]    
Investment in gold at cost $ 2,153,115 $ 2,207,626
Common stock, shares authorized Unlimited Unlimited
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 138,900,000 142,200,000
Common stock, shares outstanding 138,900,000 142,200,000
Net asset value per share (in dollars per share) $ 21.17 $ 19.88