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Derivative Instruments and Fair Value Measurements (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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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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- Definition Fair value of asset after deduction of liability. + References No definition available. + Details
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