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Statements of Changes in Net Assets - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 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
Redemptions (in Shares) (100,000)   (1,100,000)
Closing balance (in Shares) 2,650,000   2,750,000
Opening balance $ 178,252 $ 182,043 $ 182,043
Net investment loss (292) (253) (1,100)
Realized gain on investment in palladium 1,172   (1,919)
Change in unrealized gain on investment in palladium 30,623 $ 10,255 43,045
Creations     22,809
Redemptions (7,286)   (66,626)
Closing balance $ 202,469   $ 178,252