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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, 2017
USD ($)
oz
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
oz
Sep. 30, 2016
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Significant Accounting Policies [Abstract]          
Opening balance (in Ounces) | oz     806,891.3 736,849.8 736,849.8
Creations (in Ounces) | oz     38,816.2   160,724.9
Redemptions (in Ounces) | oz     (29,105.0)   (87,572.4)
Transfers of gold to pay expenses (in Ounces) | oz     (2,386.1)   (3,111.0)
Closing balance (in Ounces) | oz 814,216.4   814,216.4   806,891.3
Investment in gold, fair value, opening balance     $ 935,268 $ 782,719 $ 782,719
Creations     48,709   202,685
Redemptions     (36,251)   (100,214)
Realized gain / (loss) on gold distributed for the redemption of Shares $ 531 $ 0 903 (2,710) (5,827)
Transfers of gold to pay expenses     (2,945)   (3,868)
Realized gain on gold transferred to pay expenses 36 89 47 63 113
Change in unrealized gain on investment in gold 32,238 $ 771 98,990 $ 197,351 59,660
Investment in gold, fair value, closing balance $ 1,044,721   $ 1,044,721   $ 935,268