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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
Schedule of Investments [Abstract]    
Investment in palladium at cost $ 593,504 $ 490,759
Common stock, shares authorized Unlimited Unlimited
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares outstanding 5,537,500 4,262,500
Common stock, shares issued 5,537,500 4,262,500
Net asset value per share (in dollars per share) $ 112.35 $ 83.06