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Note 8 - Accrued Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Accrued Liabilities [Table Text Block] |
|  | December 31, |
|  | 2011 |  |  | 2012 |
Interest on long-term debt |  |  | 1,377,794 |  |  |  | 1,295,929 |
Administrative expenses |  |  | 419,027 |  |  |  | 306,058 |
Vessel operating and voyage expenses |  |  | 2,952,341 |  |  |  | 1,253,183 |
Total |  |  | 4,749,162 |  |  |  | 2,855,170 |

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- Definition Tabular disclosure of the components of accrued liabilities. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration