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Significant Accounting Policies (Schedule Of Investment In Gold) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
oz
Mar. 31, 2017
USD ($)
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 43,540.1   53,345.1
Redemptions (in Ounces) | oz (0.0)   (48,472.0)
Transfers of gold to pay expenses (in Ounces) | oz (784.8)   (3,183.4)
Closing balance (in Ounces) | oz 851,336.3   808,581.0
Investment in gold, fair value, opening balance $ 1,048,326 $ 935,268 $ 935,268
Creations 58,226   67,119
Redemptions 0   (60,954)
Realized gain on gold distributed for the redemption of Shares 0 210 2,048
Transfers of gold to pay expenses (1,035)   (3,966)
Realized gain on gold transferred to pay expenses 79 (16) 99
Change in unrealized gain on investment in gold 21,446 $ 69,391 108,712
Investment in gold, fair value, closing balance $ 1,127,042   $ 1,048,326