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Statements of Assets and Liabilities (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Investment Company [Abstract]    
Investment in palladium at cost $ 415,255 $ 334,434
Common stock, shares authorized Unlimited Unlimited
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares issued 2,150,000 1,950,000
Common stock, shares outstanding 2,150,000 1,950,000
Net asset value per share (in dollars per share) $ 209.87 $ 183.58