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Financial Highlights (Parenthetical)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Financial Highlights [Abstract]
Gross Annualized Sponsor's Fee per share	0.45%	0.45%	0.45%	0.45%

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- Definition

Annualized rate of Sponsors Fee before waiver

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No definition available.

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- Definition

Financial Highlights [Abstract]

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No definition available.

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