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Note 14 - Accrued Charter Revenue, Current and Non-current, Unearned Revenue, Current and Non-current and Time Charter Assumed, Current and Non-current (Tables)
 12 Months Ended
Dec. 31, 2023
Accrued Charter Revenue, Current and Non-Current, Unearned Revenue, Current and Non-Current and Time Charter Assumed, Current and Non-Current [Abstract]  
Schedule of Unbilled Receivables, Not Billable at Balance Sheet Date [Table Text Block]
Year ending December 31,
  
Amount
  
2024
  
$
(7,292
)
2025
    
(8,081
)
2026
    
(8,082
)
2027
    
(187
)
Total
  
$
(23,642
)
Deferred Revenue, by Arrangement, Disclosure [Table Text Block]
   
December 31,
2022
    
December 31,
2023
  
Hires collected in advance
  
$
16,906
    
$
34,258
  
Charter revenue resulting from varying charter rates
    
42,861
      
44,331
  
Unamortized balance of charters assumed
    
-
      
940
  
Total
  
$
59,767
    
$
79,529
  
Less current portion
    
(25,227
)
    
(52,177
)
Non-current portion
  
$
34,540
    
$
27,352