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Note 16 - Voyage Expenses and Vessel Operating Expenses (Details) - Voyage Expenses - USD ($)
 12 Months Ended
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