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Statements of Assets and Liabilities (Parenthetical) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Statements of Assets and Liabilities [Abstract]    
Investment in palladium at cost $ 155,318 $ 169,185
Common stock, shares issued 2,400,000 2,750,000
Common stock, shares outstanding 2,400,000 2,750,000
Net asset value per share $ 100.65 $ 64.82