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Financial Highlights - $ / shares
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Per Share Performance (for a Share outstanding throughout the entire period)    
Net asset value per Share at beginning of period $ 119.66 $ 100.65
Income from investment operations:    
Net investment loss (0.19) (0.15)
Total realized and unrealized gains or losses on investment in palladium 12.03 (8.18)
Change in net assets from operations 11.84 (8.33)
Net asset value per Share at end of period $ 131.50 $ 92.32
Weighted average number of shares 1,695,000 2,458,333
Expense ratio [1] 0.60% 0.60%
Net investment loss ratio [1] (0.60%) (0.60%)
Total return, at net asset value [2] 9.89% (8.28%)
[1] Annualized for periods of less than one year.
[2] Total return is not annualized.