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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Statements of Assets and Liabilities [Abstract]    
Investment in palladium at cost $ 181,698 $ 218,668
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 2,950,000 3,450,000
Common stock, shares outstanding 2,950,000 3,450,000
Net asset value per share $ 69.33 $ 52.77