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Schedule of Investments (oz, USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investment Holdings [Line Items]
Investment in Palladium (oz)	460,527.9us-gaap_InvestmentOwnedBalanceOtherMeasure	514,615.5us-gaap_InvestmentOwnedBalanceOtherMeasure
Cost	$ 300,253us-gaap_InvestmentOwnedAtCost	$ 335,517us-gaap_InvestmentOwnedAtCost
Fair Value	335,725us-gaap_InvestmentOwnedAtFairValue	410,663us-gaap_InvestmentOwnedAtFairValue
% of Net Assets	100.05%us-gaap_InvestmentOwnedPercentOfNetAssets	102.97%us-gaap_InvestmentOwnedPercentOfNetAssets
Palladium [Member]
Investment Holdings [Line Items]
Investment in Palladium (oz)	460,527.9us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XPD	514,615.5us-gaap_InvestmentOwnedBalanceOtherMeasure / us-gaap_CurrencyAxis = currency_XPD
Cost	300,253us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPD	335,517us-gaap_InvestmentOwnedAtCost / us-gaap_CurrencyAxis = currency_XPD
Fair Value	$ 335,725us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XPD	$ 410,663us-gaap_InvestmentOwnedAtFairValue / us-gaap_CurrencyAxis = currency_XPD
% of Net Assets	100.05%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XPD	102.97%us-gaap_InvestmentOwnedPercentOfNetAssets / us-gaap_CurrencyAxis = currency_XPD

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