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Significant Accounting Policies (Schedule Of Investment In Gold) (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
oz
Dec. 31, 2016
USD ($)
oz
Dec. 31, 2015
USD ($)
oz
Significant Accounting Policies [Abstract]      
Opening balance (in Ounces) | oz 806,891.3 736,849.8  
Creations (in Ounces) | oz 53,345.1 160,724.9  
Redemptions (in Ounces) | oz (48,472.0) (87,572.4)  
Transfers of gold to pay expenses (in Ounces) | oz (3,183.4) (3,111.0)  
Closing balance (in Ounces) | oz 808,581.0 806,891.3 736,849.8
Investment in gold, fair value, opening balance $ 935,268 $ 782,719  
Creations 67,119 202,685  
Redemptions (60,954) (100,214)  
Realized gain / (loss) on gold distributed for the redemption of Shares 2,048 (5,827) $ (3,410)
Transfers of gold to pay expenses (3,966) (3,868)  
Realized gain on gold transferred to pay expenses 99 113 (94)
Change in unrealized gain on investment in gold 108,712 59,660 (101,529)
Investment in gold, fair value, closing balance $ 1,048,326 $ 935,268 $ 782,719