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Note 8 - Accrued Liabilities
12 Months Ended
Dec. 31, 2015
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,
    2014   2015
Interest on long-term debt     1,436,466       2,536,034  
Administrative expenses     339,778       291,932  
Vessel operating and voyage expenses     2,126,783       2,774,973  
                 
Total     3,903,027       5,602,939