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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Statements of Assets and Liabilities [Abstract]    
Investment in palladium at cost $ 164,557 $ 170,040
Common stock, shares authorized Unlimited Unlimited
Common stock, par value
Common stock, shares issued 1,400,000 1,675,000
Common stock, shares outstanding 1,400,000 1,675,000
Net asset value per share $ 216.93 $ 179.39