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Significant Accounting Policies (Schedule Of Investment In Gold) (Details)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
oz
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
oz
Jun. 30, 2017
USD ($)
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     (178,781.0)   (48,472.0)
Transfers of gold to pay expenses (in Ounces) | oz     (1,066.2)   (3,183.4)
Closing balance (in Ounces) | oz 706,118.9   706,118.9   808,581.0
Investment in gold, fair value, opening balance     $ 1,048,326 $ 935,268 $ 935,268
Creations     103,156   67,119
Redemptions     (230,807)   (60,954)
Realized gain on gold distributed for the redemption of Shares $ 11,477 $ 162 11,477 372 2,048
Transfers of gold to pay expenses     (1,447)   (3,966)
Realized gain on gold transferred to pay expenses 81 27 160 11 99
Change in unrealized (loss) / gain on investment in gold (69,344) $ (2,639) (47,898) $ 66,752 108,712
Investment in gold, fair value, closing balance $ 882,967   $ 882,967   $ 1,048,326