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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Schedule of Investments [Abstract]    
Investment in palladium at cost $ 354,947 $ 334,209
Common stock, shares authorized Unlimited Unlimited
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 2,000,000 1,800,000
Common stock, shares outstanding 2,000,000 1,800,000
Net asset value per share (in dollars per share) $ 137.60 $ 164.16