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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Statements of Changes in Net Assets [Abstract]        
Opening balance (in Shares)   2,750,000 3,450,000 3,450,000
Creations (in Shares)   400,000   400,000
Redemptions (in Shares)   (600,000)   (1,100,000)
Closing balance (in Shares) 2,550,000 2,550,000   2,750,000
Opening balance   $ 178,252 $ 182,043 $ 182,043
Net investment loss $ (330) (923) (820) (1,100)
Realized gain/(loss) on investment in palladium   8,484   (1,919)
Change in unrealized gain on investment in palladium 20,188 54,846 $ 56,828 43,045
Creations   32,622   22,809
Redemptions   (45,692)   (66,626)
Closing balance $ 227,589 $ 227,589   $ 178,252