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Note 8 - Accrued Liabilities | 12 Months Ended
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Dec. 31, 2016
Notes to Financial Statements |
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block] |
8. | Accrued Liabilities
The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:
|  | December 31,
|  | 2015 |  | 2016
Interest on long-term debt |  |  | 2,536,034 |  |  |  | 2,660,766 |
Administrative expenses |  |  | 291,932 |  |  |  | 206,840 |
Vessel operating and voyage expenses |  |  | 2,774,973 |  |  |  | 2,431,873 |
Total |  |  | 5,602,939 |  |  |  | 5,299,479 |

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