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MARGIN ACCOUNTS, DERIVATIVES AND FAIR VALUE MEASURES - Forward Freight Agreements (Details) - Forward freight agreements - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Derivative, Gain (Loss) on Derivative, Net $ 326,000 $ 287,000
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Net Asset (Liability) $ (59,940) $ 265,768