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Financial Highlights (Unaudited) - $ / shares
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Per Share Performance (for a Share outstanding throughout the entire period)    
Net asset value per Share at beginning of period $ 183.58 $ 219.22
Income from investment operations:    
Net investment loss (0.30) (0.34)
Total realized and unrealized gains or losses on investment in palladium 26.59 26.47
Change in net assets from operations 26.29 26.13
Net asset value per Share at end of period $ 209.87 $ 245.35
Weighted average number of Shares 1,956,667 1,651,389
Expense ratio [1] 0.60% 0.60%
Net investment loss ratio [1] (0.60%) (0.60%)
Total return, net asset value [2] 14.32% 11.92%
[1] Annualized for periods less than one year.
[2] Total return is not annualized.