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Note 7 - Vessels and Advances, Net (Tables)
 12 Months Ended
Dec. 31, 2023
Vessels and advances, net [Abstract]  
Schedule Vessels and Advances, Net [Table Text Block]
The amounts in the accompanying consolidated balance sheets are as follows:

   
Vessel Cost
    
Accumulated
Depreciation
    
Net Book
Value
  
Balance, January 1, 2022
  
$
4,687,896
    
$
(1,037,704
)
  
$
3,650,192
  
Depreciation
    
-
      
(162,651
)
    
(162,651
)
Vessel acquisitions, advances and other vessels’ costs
    
249,023
      
-
      
249,023
  
Vessel sales, transfers and other movements
    
(140,817
)
    
71,114
      
(69,703
)
Balance, December 31, 2022
  
$
4,796,102
    
$
(1,129,241
)
  
$
3,666,861
  
Depreciation
    
-
      
(165,460
)
    
(165,460
)
Vessel acquisitions, advances and other vessels’ costs
    
88,506
      
-
      
88,506
  
Vessel sales, transfers and other movements
    
(196,884
)
    
53,774
      
(143,110
)
Balance, December 31, 2023
  
$
4,687,724
    
$
(1,240,927
)
  
$
3,446,797