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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
USD ($)
oz
Sep. 30, 2018
USD ($)
oz
Sep. 30, 2019
USD ($)
oz
Sep. 30, 2018
USD ($)
oz
Significant Accounting Policies [Abstract]        
Opening balance (in Ounces) | oz 137,029.7 152,323.9 146,915.9 228,863.1
Creations (in Ounces) | oz 4,718.2   37,852.4 23,800.7
Redemptions (in Ounces) | oz (7,079.3) (18,994.2) (49,633.9) (118,869.0)
Transfers of palladium to pay expenses (in Ounces) | oz (205.2) (428.6) (671.0) (893.7)
Closing balance (in Ounces) | oz 134,463.4 132,901.1 134,463.4 132,901.1
Investment in palladium, fair value, Opening balance $ 208,833 $ 145,165 $ 185,555 $ 241,679
Creations 7,153   55,466 24,277
Redemptions (11,080) (17,441) (69,366) (114,467)
Realized gain on palladium distributed for the redemption of Shares 4,696 3,914 25,292 30,150
Transfers of palladiuim to pay expenses (304) (407) (948) (894)
Realized gain on palladium transferred to pay expenses 120 52 365 268
Change in unrealized gain/ (loss) on investment in palladium 15,673 14,111 28,727 (35,619)
Investment in palladium, fair value, closing balance $ 225,091 $ 145,394 $ 225,091 $ 145,394