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Significant Accounting Policies (Narrative) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Significant Accounting Policies [Abstract]
Reserve for uncertain tax positions		$ 0
Annualized rate of Sponsors Fee	[1]	0.60%	0.60%
Sponsor Fees		$ 1,777,708	$ 2,983,221	$ 3,297,191
Fees payable to Sponsor		97,509	$ 212,592
All other expenses		$ 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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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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