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Significant Accounting Policies (Schedule Of Investment In Palladium) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
oz
Dec. 31, 2018
USD ($)
oz
Dec. 31, 2017
USD ($)
oz
Significant Accounting Policies [Abstract]      
Opening balance (in Ounces) | oz 146,915.9 228,863.1  
Creations (in Ounces) | oz 70,851.3 38,014.7  
Redemptions (in Ounces) | oz (59,056.9) (118,869.0)  
Transfers of palladium to pay expenses (in Ounces) | oz (895.3) (1,092.9)  
Closing balance (in Ounces) | oz 157,815.0 146,915.9 228,863.1
Investment in palladium, fair value, Opening balance $ 185,555 $ 241,679  
Creations 112,464 42,111  
Redemptions (86,192) (114,467)  
Realized gain on palladium distributed for the redemption of Shares 32,233 30,150 $ 14,337
Transfers of palladiuim to pay expenses (1,329) (1,108)  
Realized gain on palladium transferred to pay expenses 520 340 266
Change in unrealized gain/ (loss) on investment in palladium 57,387 (13,150) 77,205
Investment in palladium, fair value, closing balance $ 300,638 $ 185,555 $ 241,679