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Condensed Statements of Assets and Liabilities (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Condensed Statements of Assets and Liabilities [Abstract]    
Common stock, shares authorized unlimited unlimited
Common stock, par value $ 0us-gaap_CommonStockNoParValue $ 0us-gaap_CommonStockNoParValue
Investment in palladium at cost $ 300,253us-gaap_InvestmentOwnedAtCost $ 335,517us-gaap_InvestmentOwnedAtCost
Common stock, shares issued 4,750,000us-gaap_CommonStockSharesIssued 5,150,000us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 4,750,000us-gaap_CommonStockSharesOutstanding 5,150,000us-gaap_CommonStockSharesOutstanding
Net asset value per share $ 70.64pall_NetAssetValuePerShare $ 77.44pall_NetAssetValuePerShare