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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
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
Reserve for uncertain tax positions 0   $ 0   0
Annualized rate of Sponsors Fee     0.39%    
Sponsor Fees 1,073,854 $ 835,812 $ 2,908,753 $ 2,633,333  
Fees payable to Sponsor 356,493   356,493   $ 260,280
All other expenses $ 0 $ 0 $ 0 $ 0