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Interest and Finance Costs, Net - Schedule of Interest and Finance Costs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Pyxis Maritime Corporation |  |  |
Interest on long-term debt | $ 4,184 | $ 5,122 | $ 3,835
Interest on promissory note | 452 | 395 | 213
Long-term debt prepayment fees |  |  | 56
Amortization and write-off of financing costs | 328 | 258 | 386
Total | $ 4,964 | $ 5,775 | $ 4,490

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