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Note 8 - Accrued Liabilities
12 Months Ended
Dec. 31, 2014
Disclosure Text Block Supplement [Abstract]  
Accounts Payable, Accrued Liabilities, and Other Liabilities Disclosure, Current [Text Block]
8.
Accrued Liabilities

The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:

   
December 31,
 
   
2013
   
2014
 
Interest on long-term debt
    1,099,771       1,436,466  
Administrative expenses
    203,396       339,778  
Vessel operating and voyage expenses
    1,577,210       2,126,783  
                 
Total
    2,880,377       3,903,027