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Accrued Liabilities | 12 Months Ended
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Dec. 31, 2019
Payables and Accruals [Abstract] |
Accrued Liabilities | 8. Accrued Liabilities The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:
|  | December 31, |
|  | 2018 |  |  | 2019 |
Interest on long-term debt |  |  | 3,656,811 |  |  |  | 2,790,621 |
Administrative expenses |  |  | 251,257 |  |  |  | 205,184 |
Other operating costs |  |  | 660,000 |  |  |  | — |
Vessel operating and voyage expenses |  |  | 2,311,420 |  |  |  | 3,006,274 |
Total |  |  | 6,879,488 |  |  |  | 6,002,079 |

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