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Financial Highlights - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Per Share Performance (for a Share outstanding throughout the entire period)      
Net asset value per Share at beginning of period $ 179.39 $ 119.66 $ 100.65
Income from investment operations:      
Net investment loss (1.25) (0.88) (0.59)
Total realized and unrealized gains or losses on investment in palladium 41.08 60.61 19.60
Change in net assets from operations 39.83 59.73 19.01
Net asset value per Share at end of period $ 219.22 $ 179.39 $ 119.66
Weighted average number of Shares 1,615,779 1,590,959 1,826,301
Expense ratio 0.60% 0.60% 0.60%
Net investment loss ratio (0.60%) (0.60%) (0.60%)
Total return, net asset value 22.20% 49.92% 18.89%