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Note 6 - Vessels, Net (Tables)
 6 Months Ended
Jun. 30, 2017
Notes Tables  
Schedule Vessels, Net [Table Text Block]
    Vessel Cost   Accumulated
Depreciation		   Net Book
Value
Balance, January 1, 2017   $
2,688,887
     $
(1,000,602
 )   $
1,688,285
  
Depreciation    
-
      
(42,215
 )    
(42,215
 )
Vessel acquisitions and other vessels’ costs    
54,523
      
-
      
54,523
  
Disposals, transfers and other movements    
(96,889
 )    
40,281
      
(56,608
 )
Balance, June 30, 2017   $
2,646,521
     $
(1,002,536
 )   $
1,643,985