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Significant Accounting Policies (Narrative) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Significant Accounting Policies [Abstract]
Reserve for uncertain tax positions		$ 0
Expense ratio	[1]	0.60%	0.60%
Sponsor Fees		$ 3,123,275	$ 4,376,182	$ 4,973,343	$ 4,973,343
Fees payable to Sponsor		205,938	320,608
All other expenses		$ 0	$ 0	$ 0
[1] Effective January 1, 2014, the Trust has adopted the provisions of Topic 946. Refer to Note 2.1 for additional information.

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Annualized rate of sponsors fee.

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Amount for accounts payable to related parties. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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The noncurrent portion of the amount recognized for uncertain tax positions as of the balance sheet date.

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Fees paid to advisors who provide certain management support and administrative oversight services including the organization and sale of stock, investment funds, limited partnerships and mutual funds.

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