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Note 4 - Vessels, Net and Advances for Vessels Under Construction (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    Vessel Cost and advances for vessel under construction   Accumulated Depreciation   Net Book Value
Balance, December 31, 2016    
130,185
      
(4,015
 )    
126,170
  
— Acquisitions    
34,508
      
(420
 )    
34,088
  
— Advances for vessels under construction    
119
      
-
      
119
  
— Depreciation charge for the period    
-
      
(2,370
 )    
(2,370
 )
Balance, June 30, 2017    
164,812
      
(6,805
 )    
158,007