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MARGIN ACCOUNTS, DERIVATIVES AND FAIR VALUE MEASURES - Fair Value Hierarchy (Details) - Recurring - USD ($)
Dec. 31, 2018
Dec. 31, 2017
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)