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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statements of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 2,750,000 3,450,000 5,150,000
Creations (in Shares) 450,000 400,000 150,000
Redemptions (in Shares) (800,000) (1,100,000) (1,850,000)
Closing balance (in Shares) 2,400,000 2,750,000 3,450,000
Opening balance $ 178,252 $ 182,043 $ 398,834
Net investment loss (1,278) (1,100) (1,778)
Realized gain/(loss) on investment in palladium 14,603 (1,919) 5,238
Change in unrealized gain on investment in palladium 77,205 43,045 (109,035)
Change in unrealized loss on unsettled creations or redemptions     (190)
Creations 37,402 22,809 7,799
Redemptions (64,629) (66,626) (118,825)
Closing balance $ 241,555 $ 178,252 $ 182,043