v3.26.1
Note 8 - Vessels and Advances, Net (Details Textual)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2025
USD ($)
Carrying Capacity of Vessels at Period End (TEU) 519,530   519,530
Vessels Impairment Loss $ 0 $ 0  
Number of Vessels Provided as Collaterals to Secure Loans 57    
Carrying Value of Vessels Provided as Collaterals to Secure Loans $ 2,301,599    
Four Newbuild Container Vessels [Member]      
Number of Vessels Under Construction 4    
Carrying Capacity of Vessels at Period End (TEU) 3,100    
Six newbuild container vessels [member]      
Number of Vessels Under Construction 6   6
Carrying Capacity of Vessels at Period End (TEU) 9,200   3,100
Time Charter Assumed, Amortization Period (Year)     8 years
Second group of six newbuild container vessels [member]      
Number of Vessels Under Construction 6    
Carrying Capacity of Vessels at Period End (TEU) 9,200    
Two 2001-Built, 5,610 TEU Second-Hand Container Vessels [Member]      
Number of Vessels Acquired 2    
Carrying Capacity of Vessels Acquired (TEU) 5,610    
Payments to Acquire Productive Assets $ 7,200    
Polar Brasil [Member]      
Carrying Capacity of Vessels at Period End (TEU)     3,800
Maersk Puelo [member]      
Carrying Capacity of Vessels at Period End (TEU)     6,541
Deferred Rent Recognized     $ 46,500
Maersk Puelo and Six newbuild container vessels [member]      
Payments to Acquire Productive Assets     $ 55,848
Porto Kagio and Porto Germeno [Member]      
Asset, Held-for-Sale, Not Part of Disposal Group $ 45,494