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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Statements of Assets and Liabilities [Abstract]    
Investment in palladium at cost $ 94,652 $ 155,318
Common stock, shares authorized Unlimited Unlimited
Common stock, par value $ 0 $ 0
Common stock, shares issued 1,400,000 2,400,000
Common stock, shares outstanding 1,400,000 2,400,000
Net asset value per share $ 103.80 $ 100.65