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Summary of Significant Accounting Policies - Advanced Hire, Prepaid Expenses and Other Current Assets (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019
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Accounting Policies [Abstract] |  |
Advance hire | $ 5,026,953 | $ 3,985,826
Prepaid expenses | 3,706,396 | 4,924,557
Accrued receivables | 6,823,409 | 6,466,068
Margin Deposit | 814,062 | 269,379
Other current assets | 3,145,125 | 3,124,995
Total | $ 19,515,945 | $ 18,770,825

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