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MARGIN ACCOUNTS, DERIVATIVES AND FAIR VALUE MEASURES - Fair Value Hierarchy (Details) - Recurring - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Margin accounts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) | $ 1,820,657 | $ 912,981
Fuel swap contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) |  | 377,273
Forward freight agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) | (59,940) | 265,768
Level 1 | Margin accounts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) | 1,820,657 | 912,981
Level 2 | Fuel swap contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) |  | 377,273
Level 2 | Forward freight agreements |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) | (59,940) | 265,768
Fuel | Fuel swap contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) | (3,165,967) | $ 377,000
Fuel | Level 2 | Fuel swap contracts |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Fair Value, Net Asset (Liability) | $ (3,165,967) |

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