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Contracts and Agreements (Brokerage Commissions) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions	$ 3,728	$ 1,116	$ 10,165	$ 2,516
Brokerage commissions as a percentage of average daily net assets	0.03%	0.01%	0.03%	0.01%
Rebalancing Investments Transaction [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions			$ 6,247	$ 1,984
Brokerage commissions as a percentage of average daily net assets	61.46%	78.86%	61.46%	78.86%
Trades Necessitated By Creation And Redemption Activity [Member]
Long Duration Contracts Assumptions By Product And Guarantee [Line Items]
Brokerage commissions			$ 3,918	$ 532
Brokerage commissions as a percentage of average daily net assets	38.54%	21.14%	38.54%	21.14%