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Significant Accounting Policies (Schedule Of Investment In Gold) (Details)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
oz
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
oz
Sep. 30, 2017
USD ($)
oz
Dec. 31, 2017
USD ($)
oz
Significant Accounting Policies [Abstract]          
Opening balance (in Ounces) | oz     808,581.0 806,891.3 806,891.3
Creations (in Ounces) | oz     77,385.1   53,345.1
Redemptions (in Ounces) | oz     (231,896.7)   (48,472.0)
Transfers of gold to pay expenses (in Ounces) | oz     (2,339.5)   (3,183.4)
Closing balance (in Ounces) | oz 651,729.9   651,729.9   808,581.0
Investment in gold, fair value, opening balance     $ 1,048,326 $ 935,268 $ 935,268
Creations     103,156   67,119
Redemptions     (295,298)   (60,954)
Realized (loss) / gain on gold distributed for the redemption of Shares $ (672) $ 531 10,805 903 2,048
Transfers of gold to pay expenses     (3,034)   (3,966)
Realized gain on gold transferred to pay expenses 11 36 171 47 99
Change in unrealized (loss) / gain on investment in gold (42,462) $ 32,238 (90,360) $ 98,990 108,712
Investment in gold, fair value, closing balance $ 773,766   $ 773,766   $ 1,048,326