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Note 3 - Inventories (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
      2018       2019  
Lubricants    
1,043,763
     
1,728,861
 
Victualing    
79,965
     
160,303
 
Bunkers    
580,663
     
-
 
Total    
1,704,391
     
1,889,164