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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Significant Accounting Policies [Abstract]          
Percentage of gold held by UBS A.G. 0.00%   0.00%    
Basket of shares     50,000    
Fair value transfers $ 0   $ 0   $ 0
Gold receivable 0   0    
Gold payable 0   $ 0    
Annualized rate of Sponsors Fee     0.39%    
Reserve for uncertain tax positions 0   $ 0   0
Sponsor Fees 1,061,745 $ 986,760 2,122,905 $ 1,945,957  
Fees payable to Sponsor 1,022,445   1,022,445   $ 346,853
All other expenses $ 0 $ 0 $ 0 $ 0