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Note 8 - Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, |
|  | 2016 |  |  | 2017 |
Interest on long-term debt |  |  | 2,660,766 |  |  |  | 2,839,121 |
Administrative expenses |  |  | 206,840 |  |  |  | 204,472 |
Other operating costs |  |  | — |  |  |  | 563,333 |
Vessel operating and voyage expenses |  |  | 2,431,873 |  |  |  | 2,273,553 |
Total |  |  | 5,299,479 |  |  |  | 5,880,479 |

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