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Note 5 - Advances for Vessels Under Construction and Acquisitions (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Advances for Vessels Under Construction and Acquisitions [Table Text Block]
Balance, December 31, 2015    
44,031,882
  
Advances for vessels under construction and acquisitions    
51,949,154
  
Capitalized interest    
1,660,802
  
Capitalized expenses    
2,576,626
  
Vessels delivered    
(44,432,663
 )
         
Balance, December 31, 2016    
55,785,801
  
Advances for vessels under construction and acquisitions    
57,805,820
  
Capitalized interest    
813,423
  
Capitalized expenses    
2,475,138
  
Vessels delivered    
(55,302,364
 )
         
Balance, December 31, 2017    
61,577,818