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Note 3 - Vessels (Tables)
 9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule Of Vessel And Vessel Improvements [Table Text Block]
Vessels and vessel improvements, at December 31, 2015
   $ 733,960,731  
Purchase of vessel improvements
     199,675  
Disposal of vessels
     (13,102,860
)
Depreciation expense
     (26,469,088
)
Vessel impairment charge
     (6,167,262
)
Vessels and Vessel Improvements, at September 30, 2016
   $ 688,421,196