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Condensed Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Condensed Statements of Assets and Liabilities [Abstract]    
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Investment in palladium at cost $ 223,727 $ 335,517
Common stock, shares issued 3,550,000 5,150,000
Common stock, shares outstanding 3,550,000 5,150,000
Net asset value per share $ 63.86 $ 77.44