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Statement of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Statement of Changes in Net Assets [Abstract]      
Opening balance (in Shares) 3,450,000 5,150,000 5,150,000
Creations (in Shares) 100,000   150,000
Redemptions (in Shares) (300,000)   (1,850,000)
Closing balance (in Shares) 3,250,000   3,450,000
Opening balance $ 182,043 $ 398,834 $ 398,834
Net investment loss (253) (548) (1,778)
Realized loss on investment in palladium (3,831)   5,238
Change in unrealized gain on investment in palladium 10,255 $ (39,675) (109,035)
Change in unrealized loss on unsettled creations or redemptions     (190)
Creations 5,301   7,799
Redemptions (15,394)   (118,825)
Closing balance $ 178,121   $ 182,043