v3.25.2
Note 1 - Basis of Presentation and General Information (Details Textual)
6 Months Ended
May 06, 2025
USD ($)
shares
Mar. 30, 2023
USD ($)
Jun. 30, 2025
USD ($)
shares
Jun. 30, 2024
USD ($)
shares
Mar. 31, 2025
Dec. 31, 2024
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) | shares     21,807,619      
Common Stock, Shares, Outstanding (in shares) | shares     120,269,324      
Net Assets | $ $ 699,239,000          
Payments of Distributions to Affiliates | $     $ 100,000,000 $ (0)    
Number of Container Vessels     68     68
Carrying Capacity of Vessels at Period End (TEU)     512,989     512,989
LIBERIA            
Number of Subsidiaries     83      
MARSHALL ISLANDS            
Number of Subsidiaries     13      
Company Incorporated Under Laws of Jersey [Member] | LIBERIA            
Number of Subsidiaries     5      
Company Incorporated Under Laws of Jersey [Member] | MARSHALL ISLANDS            
Number of Subsidiaries     46      
Company Incorporated Under Laws of Jersey [Member] | JERSEY            
Number of Majority Owned Subsidiaries     1      
Common Stock [Member]            
Stock Issued During Period, Shares, New Issues (in shares) | shares     314,891 1,088,601    
Neptune [Member]            
Business Acquisition, Percentage of Voting Interests Acquired   75.00%        
Number of Dry-bulk Vessels   3        
Neptune [Member] | Common Stock [Member]            
Business Acquisition, Percentage of Voting Interests Acquired   40.00%        
Neptune [Member] | Preferred Stock [Member]            
Business Acquisition, Percentage of Voting Interests Acquired   79.05%        
Neptune [Member]            
Investment, Agreed Amount | $   $ 200,000,000        
Costamare Bulkers Holdings Limited (CBHL) [Member]            
Number of Controlled Companies         67  
Number of Controlled Companies, Dry Bulk Vessels Owned         38  
Number of Controlled Companies, Dry Bulk Vessels Previously Owned or To-Be-Sold         17  
Number of Controlled Companies, Dry Bulk Vessels To-Be-Acquired         12  
Costamare Bulkers Inc. (“CBI”) [Member]            
Conversion of Stock, Shares Issued (in shares) | shares 5          
Net Assets | $ $ 699,239          
Payments of Distributions to Affiliates | $ 100,000          
Payment for Debt Extinguishment or Debt Prepayment Cost | $ $ 150,225          
Costamare Shareholders [Member] | Costamare Bulkers Inc. (“CBI”) [Member]            
Stock Issued During Period, Shares, New Issues (in shares) | shares 24,022,218          
Konstantakopoulos Family [Member]            
Percentage Ownership     63.60%      
Common Stock Issued to Costamare Shipping Services Ltd. [Member]            
Stock Issued During Period, Shares, New Issues (in shares) | shares     299,200