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Note 1 - Basis of Presentation and General Information (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
shares
Stock Issued During Period, Shares, Dividend Reinvestment Plan (in shares) | shares     20,810,518    
Common Stock, Shares, Outstanding (in shares) | shares     118,374,623    
Number of Container Vessels   69 68 69  
Carrying Capacity of Vessels at Period End (TEU)   525,821 512,989 525,821  
Number of Dry-bulk Vessels   45 42 45  
Dead Weight Tonnage of Dry-bulk Vessels   2,436,134 2,604,720 2,436,134  
Equity, Attributable to Noncontrolling Interest   $ 0 $ 56,229 $ 0  
Charter Rates, Increase (Decrease) in Rates, Percentage     (84.00%)    
Demand for Seaborne Dry Bulk Trade, Increase (Decrease), Compared to Previous Year, Percent     75.00% (49.00%)  
LIBERIA          
Number of Subsidiaries     146    
LIBERIA | Company Incorporated Under Laws of Jersey [Member]          
Number of Subsidiaries     1    
MARSHALL ISLANDS          
Number of Subsidiaries     13    
Number of Majority Owned Subsidiaries     1    
MARSHALL ISLANDS | Company Incorporated Under Laws of Jersey [Member]          
Number of Subsidiaries     25    
CYPRUS          
Number of Subsidiaries     1    
JERSEY          
Number of Subsidiaries     1    
Common Stock [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     2,340,720 3,053,309 1,824,466
Neptune [Member]          
Number of Container Vessels 1        
Number of Dry-bulk Vessels 3        
Business Acquisition, Percentage of Voting Interests Acquired 75.00%        
Payments to Acquire Businesses, Gross $ 11,099        
Number of Vessels 4        
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        
Konstantakopoulos Family [Member]          
Percentage Ownership     64.10%    
Costamare Bulkers Inc. ("CBI") [Member]          
Number of Dry-bulk Vessels     56    
Investment, Agreed Amount   $ 200,000      
Neptune [Member]          
Equity, Attributable to Noncontrolling Interest $ 34,132        
Common Stock Issued to Costamare Shipping Services Ltd. [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     598,400