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Financial Highlights - $ / shares
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Per Share Performance (for a Share outstanding throughout the entire period)      
Net asset value per Share at beginning of year $ 64.82 $ 52.77 $ 77.44
Income from investment operations:      
Net investment loss (0.50) (0.35) (0.41)
Total realized and unrealized gains or losses on investment in palladium 36.33 12.40 (24.26)
Change in net assets from operations 35.83 12.05 (24.67)
Net asset value per Share at end of year $ 100.65 $ 64.82 $ 52.77
Weighted average number of shares 2,559,726 3,114,344 4,350,137
Expense ratio 0.60% 0.60% 0.60%
Net investment loss ratio (0.60%) (0.60%) (0.60%)
Total return, at net asset value 55.28% 22.83% (31.86%)