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Note 4 - Inventories (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Inventory, Current [Table Text Block]
   
December 31,
 
   
2011
   
2012
 
             
Bunkers
    1,325,541       1,854,589  
Lubricants
    1,090,567       1,297,818  
Total
    2,416,108       3,152,407