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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Statements of Assets and Liabilities [Abstract]    
Investment in palladium at cost $ 163,698 $ 169,185
Common stock, shares authorized Unlimited Unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 2,550,000 2,750,000
Common stock, shares outstanding 2,550,000 2,750,000
Net asset value per share $ 89.25 $ 64.82