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Note 8 - Accrued Liabilities
12 Months Ended
Dec. 31, 2017
Notes to Financial Statements  
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,
 
   
2016
   
2017
 
Interest on long-term debt    
2,660,766
     
2,839,121
 
Administrative expenses    
206,840
     
204,472
 
Other operating costs    
     
563,333
 
Vessel operating and voyage expenses    
2,431,873
     
2,273,553
 
                 
Total    
5,299,479
     
5,880,479