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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2013
   
2014
 
Bunkers
    930,630       1,426,838  
Lubricants
    1,530,463       1,531,828  
                 
Total
    2,461,093       2,958,666