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Significant Accounting Policies (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Significant Accounting Policies [Abstract]      
Percentage of gold held by UBS A.G. 0.00%    
Basket of shares 50,000    
Fair value transfers $ 0   $ 0
Reserve for uncertain tax positions $ 0   0
Annualized rate of Sponsors Fee 0.39%    
Sponsor Fees $ 959,197 $ 851,857  
Fees payable to Sponsor 338,805   $ 315,510
All other expenses $ 0 $ 0