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Financial Highlights - $ / shares
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Per Share Performance (for a Share outstanding throughout the entire period)        
Net asset value per Share at beginning of period $ 65.51 $ 82.16 $ 77.44 $ 69.42
Income from investment operations:        
Net investment loss (0.10) (0.12) (0.32) (0.35)
Total realized and unrealized gains or losses on investment in palladium (1.55) (6.71) (13.26) 6.26
Change in net assets from operations (1.65) (6.83) (13.58) 5.91
Net asset value per Share at end of period $ 63.86 $ 75.33 $ 63.86 $ 75.33
Weighted average number of shares 4,157,609 6,362,500 4,613,919 6,591,941
Expense Ratio        
Annualized Sponsor's fee per Share 0.60% 0.60% 0.60% 0.60%
Net Investment Loss Ratio        
Annualized net investment loss ratio (0.60%) (0.60%) (0.60%) (0.60%)
Non-Annualized Total Return (2.52%) (8.31%) (17.54%) 8.51%