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Note 4 - Inventories
12 Months Ended
Dec. 31, 2016
Notes to Financial Statements  
Inventory Disclosure [Text Block]
4.
Inventories
 
The amounts shown in the accompanying consolidated balance sheets are analyzed as follows:
 
    December 31,
    2015   2016
Bunkers    
1,116,604
     
1,231,188
 
Lubricants    
1,799,650
     
1,577,935
 
                 
Total    
2,916,254
     
2,809,123