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Offsetting. (Details) - Offsetting Assets (USD $)	Dec. 31, 2014	Dec. 31, 2013
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	$ 624,202	$ 981,232
Gross Amounts Offset in the Statement of Financial Condition	(142,271)	(218,596)
Net Amounts of Assets Presented in the Statement of Financial Condition	481,931us-gaap_DerivativeAssets	762,636us-gaap_DerivativeAssets
Futures and Forward Contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	624,202	981,232
Gross Amounts Offset in the Statement of Financial Condition	(142,271)	(218,596)
Net Amounts of Assets Presented in the Statement of Financial Condition	481,931	762,636
Purchased Options on Futures Contracts [Member]
Offsetting Assets [Line Items]
Gross Amounts of Recognized Assets	0	0
Gross Amounts Offset in the Statement of Financial Condition	0	0
Net Amounts of Assets Presented in the Statement of Financial Condition	$ 0	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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