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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Advanced Hire, Prepaid Expenses and Other Current Assets (Details) - USD ($)
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]    
Advance hire $ 5,851,070 $ 3,628,417
Prepaid expenses 1,276,901 460,445
Accrued receivables 2,479,800 6,153,212
Margin Deposit 1,820,656 912,981
Other current assets 759,124 877,217
Total $ 12,187,551 $ 12,032,272