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Fair Value of Financial Instruments (Fair Value of Derivative Instruments) (Details) - USD ($)	Dec. 31, 2015	Dec. 31, 2014
Commodity Contracts | Futures | Assets
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ (19,971,629)	$ (17,096,060)

X

- Definition

Fair value as of the balance sheet date of derivative instrument not designated as hedging instrument and classified as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

+ Details

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Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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X

- Details

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- Details

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