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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 palladium held by the Zurich Sub-Custodian 59.00%   59.00%    
Basket of shares     50,000    
Fair value transfers $ 0   $ 0   $ 0
Palladium receivable 0   0    
Palladium payable 0   0    
Reserve for uncertain tax positions $ 0   $ 0   0
Annualized rate of Sponsors Fee [1] 0.60% 0.60% 0.60% 0.60%  
Sponsor Fees $ 274,820 $ 301,354 $ 632,012 $ 593,250  
Fees payable to Sponsor 268,312   268,312   $ 124,409
All other expenses $ 0 $ 0 $ 0 $ 0  
[1] Annualized for periods of less than one year.