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Note 3 - Advances for Vessels Under Construction and Vessel Acquisition Deposits (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule of Advances for Property, Plant, and Equipment [Table Text Block]
    Costs
Balance, January 1, 2017    
17,753,737
  
Advances for vessels under construction    
3,016,069
  
Advances for vessel acquisitions    
3,810,765
  
New building vessel delivered during the period    
(17,788,540
 )
Vessels delivered during the period    
(4,473,448
 )
Balance, June 30, 2017    
2,318,583