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Note 3 - Advances for Vessels Under Construction and Vessel Acquisition Deposits (Tables)
 3 Months Ended
Mar. 31, 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    
668,402
  
Advances for vessel acquisition    
3,810,765
  
New building vessel delivered during the period    
(17,749,847
 )
Vessel delivered during the period    
(4,473,448
 )
Balance, March 31, 2017    
9,609