Derivative Financial Instruments (Schedule of Derivative Instruments in Statement of Financial Position, Fair Value) (Detail) - USD ($)	9 Months Ended	12 Months Ended
Sep. 30, 2015	Dec. 31, 2014
Derivative Instruments Not Designated as Hedging Instruments, Type	Commodity swap contracts	Commodity swap contracts
Derivative Liability, Current	$ 31,290	$ 3,023,271

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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