Significant Accounting Policies (Schedule Of Investment In Palladium) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) oz	Dec. 31, 2017 USD ($) oz	Dec. 31, 2016 USD ($) oz
Significant Accounting Policies [Abstract]
Opening balance (in Ounces) | oz	228,863.1	263,819.3
Creations (in Ounces) | oz	38,014.7	43,021.8
Redemptions (in Ounces) | oz	(118,869.0)	(76,489.4)
Transfers of palladium to pay expenses (in Ounces) | oz	(1,092.9)	(1,488.6)
Closing balance (in Ounces) | oz	146,915.9	228,863.1	263,819.3
Investment in palladium, fair value, Opening balance	$ 241,679	$ 178,342
Creations	42,111	37,402
Redemptions	(114,467)	(64,629)
Realized gain on palladium distributed for the redemption of Shares	30,150	14,337	$ (1,837)
Transfers of palladiuim to pay expenses	(1,108)	(1,244)
Realized gain on palladium transferred to pay expenses	340	266	(82)
Change in unrealized (loss) /gain on investment in palladium	(13,150)	77,205	43,045
Investment in palladium, fair value, closing balance	$ 185,555	$ 241,679	$ 178,342