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Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items] |  |  |
Voyage expenses | $ 17,575,538 | $ 14,087,511 | $ 14,302,630
Port Expenses [Member] |  |  |
Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items] |  |  |
Voyage expenses | 3,960,574 | 2,278,961 | 2,067,494
Bunkers [Member] |  |  |
Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items] |  |  |
Voyage expenses | 8,566,490 | 7,553,318 | 8,347,130
Commissions [Member] |  |  |
Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items] |  |  |
Voyage expenses | 4,112,177 | 3,725,645 | 3,244,939
Other Voyage Expenses [Member] |  |  |
Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses [Line Items] |  |  |
Voyage expenses | $ 936,297 | $ 529,587 | $ 643,067

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