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Significant Accounting Policies (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Significant Accounting Policies [Abstract]
Basket of shares	50,000
Fair value transfers	$ 0	$ 0
Reserve for uncertain tax positions	$ 0	$ 0
Annualized rate of Sponsors Fee	0.60%	0.60%	0.60%
Sponsor Fees	$ 2,132,987	$ 1,942,976	$ 1,283,558
Fees payable to Sponsor	182,586	183,974
All other expenses	$ 0	$ 0

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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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