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Derivative Instruments and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Margin Accounts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	$ (756,026)	$ (488,084)
Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	(1,053,975)	20,950
Fuel Swap Contracts [Member] | Fuel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	281,142	(303,675)
Fair Value, Inputs, Level 1 [Member] | Margin Accounts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	(756,026)	(488,084)
Fair Value, Inputs, Level 2 [Member] | Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	(1,053,975)	(20,950)
Fair Value, Inputs, Level 2 [Member] | Fuel Swap Contracts [Member] | Fuel [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value, net asset (liability)	$ 281,142	$ (303,675)

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Fair value of asset after deduction of liability.

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