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Derivative Instruments and Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value | The following table summarizes assets and liabilities measured at fair value on a recurring basis at June 30, 2017 and December 31, 2016:
| Balance at June 30, 2017 |  | Level 1 |  | Level 2 |  | Level 3
| (unaudited) |  |  |  |  |  |
Margin accounts | $ | 756,026 |  |  | $ | 756,026 |  |  | $ | — |  |  | $ | — |
Fuel swaps | $ | (281,142 | ) |  | $ | — |  |  | $ | (281,142 | ) |  | $ | — |
Freight forward agreements | $ | 1,053,975 |  |  | $ | — |  |  | $ | 1,053,975 |  |  | $ | — |
| Balance at December 31, 2016 |  | Level 1 |  | Level 2 |  | Level 3
Margin accounts | $ | 488,084 |  |  | $ | 488,084 |  |  | $ | — |  |  | $ | — |
Fuel swaps | $ | 303,675 |  |  | $ | — |  |  | $ | 303,675 |  |  | $ | — |
Freight forward agreements | $ | (20,950 | ) |  | $ | — |  |  | $ | (20,950 | ) |  | $ | — |

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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