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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
oz
Jun. 30, 2018
USD ($)
oz
Jun. 30, 2019
USD ($)
oz
Jun. 30, 2018
USD ($)
oz
Significant Accounting Policies [Abstract]        
Opening balance (in Ounces) | oz 170,362.8 238,044.7 146,915.9 228,863.1
Creations (in Ounces) | oz   9,512.7 33,134.3 23,800.7
Redemptions (in Ounces) | oz (33,090.0) (95,111.8) (42,554.5) (99,874.8)
Transfers of palladium to pay expenses (in Ounces) | oz (243.1) (121.7) (466.0) (465.1)
Closing balance (in Ounces) | oz 137,029.7 152,323.9 137,029.7 152,323.9
Investment in palladium, fair value, Opening balance $ 236,804 $ 230,903 $ 185,555 $ 241,679
Creations   9,351 48,313 24,277
Redemptions (44,785) (92,077) (58,286) (97,026)
Realized gain on palladium distributed for the redemption of Shares 15,187 24,563 20,595 26,237
Transfers of palladiuim to pay expenses (344) (124) (645) (487)
Realized gain on palladium transferred to pay expenses 127 89 246 216
Change in unrealized gain/ (loss) on investment in palladium 1,844 (27,540) 13,055 (49,731)
Investment in palladium, fair value, closing balance $ 208,833 $ 145,165 $ 208,833 $ 145,165