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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
USD ($)
oz
Mar. 31, 2019
USD ($)
oz
Significant Accounting Policies [Abstract]    
Opening balance (in Ounces) | oz 157,815.0 146,915.9
Creations (in Ounces) | oz 23,524.8 33,134.3
Redemptions (in Ounces) | oz (49,385.6) (9,464.5)
Transfers of palladium to pay expenses (in Ounces) | oz (239.7) (222.9)
Closing balance (in Ounces) | oz 131,714.5 170,362.8
Investment in palladium, fair value, Opening balance $ 300,638 $ 185,555
Creations 53,808 48,313
Redemptions (98,257) (13,500)
Realized gain on palladium distributed for the redemption of Shares 39,238 5,408
Transfers of palladiuim to pay expenses (531) (300)
Realized gain on palladium transferred to pay expenses 258 118
Change in unrealized gain/ (loss) on investment in palladium 8,711 11,210
Investment in palladium, fair value, closing balance $ 303,865 $ 236,804