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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Statements of Assets and Liabilities [Abstract]    
Investment in palladium at cost $ 152,383 $ 112,344
Common stock, shares authorized Unlimited Unlimited
Common stock, par value
Common stock, shares issued 1,750,000 1,550,000
Common stock, shares outstanding 1,750,000 1,550,000
Net asset value per share $ 131.50 $ 119.66