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Note 8 - Accrued Liabilities (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Accrued Liabilities [Table Text Block]
   
December 31,
 
   
2011
   
2012
 
             
Interest on long-term debt
    1,377,794       1,295,929  
Administrative expenses
    419,027       306,058  
Vessel operating and voyage expenses
    2,952,341       1,253,183  
Total
    4,749,162       2,855,170