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Capital Stock and Changes in Capital Accounts (Narrative Stocks) (Details)
 12 Months Ended
Dec. 18, 2024
USD ($)
$ / shares
Aug. 30, 2024
USD ($)
$ / shares
Jun. 18, 2024
USD ($)
$ / shares
Mar. 12, 2024
USD ($)
$ / shares
Dec. 04, 2023
$ / shares
shares
Sep. 08, 2023
USD ($)
$ / shares
shares
Jul. 10, 2023
USD ($)
$ / shares
shares
Jun. 09, 2023
USD ($)
$ / shares
Mar. 20, 2023
USD ($)
$ / shares
Dec. 15, 2022
USD ($)
$ / shares
Aug. 19, 2022
$ / shares
Jun. 17, 2022
$ / shares
Mar. 21, 2022
$ / shares
Dec. 31, 2024
USD ($)
shares
Item
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2022
USD ($)
Vessels
$ / shares
shares
Dec. 02, 2024
$ / shares
shares
Dec. 14, 2023
$ / shares
shares
Class Of Stock [Line Items]                                    
Issuance of new shares                           9,837,680        
Shares issued price per share | $ / shares                           $ 2.86        
Cash dividends on preferred stock | $                           $ 5,769,000 $ 5,769,000 $ 5,769,000    
Payments for repurchase of common stock | $                               $ 3,799,000    
Dividend paid on common stock per share | $ / shares $ 0.01 $ 0.075 $ 0.075 $ 0.075 $ 0.15 $ 0.15 $ 0.15   $ 0.15 $ 0.175 $ 0.275 $ 0.25 $ 0.20 $ 0.90 $ 0.60 $ 0.235    
Cash dividend | $ $ 1,252,000 $ 9,384,000 $ 9,379,000 $ 8,989,000   $ 13,041,000 $ 12,424,000   $ 15,965,000         $ 29,004,000 $ 64,276,000 $ 79,812,000    
Common Stock Dividends, Shares         4,831,777 831,672 965,044                      
Dividends Paid-in-kind | $               $ 10,761,000   $ 18,189,000         10,761,000 18,189,000    
Issuance of stock | $                           $ 28,047,000 22,846,000 5,322,000    
Dividends Paid-in-kind, per share | $ / shares               $ 0.10   $ 0.18                
Number of warrants exercised                           6,392,765        
Value of warrants | $                             7,914,000      
Proceeds from warrant exercises | $                           $ 24,195,000        
Tender offer, price per share | $ / shares                                 $ 2.00  
Tender offer, share to purchase                                 15,000,000  
Warrant liability | $                           1,802,000 6,332,000      
Gain on warrants | $                           (719,000) $ (1,583,000) $ 0    
If All Warrants Are Exercised [Member]                                    
Class Of Stock [Line Items]                                    
Issuance of stock | $                           80,049,000        
Proceeds from warrant exercises | $                           $ 90,452,000        
Number of warrants                           36,369,395        
Series D Preferred Stock [Member] | Mrs. Semiramis Paliou                                    
Class Of Stock [Line Items]                                    
Cash dividends on preferred stock | $                           $ 0        
Preferred Stock [Member]                                    
Class Of Stock [Line Items]                                    
Preferred stock, Shares authorized                           50,000,000 50,000,000      
Preferred stock, Par value per share | $ / shares                           $ 0.01 $ 0.01      
Preferred Stock [Member] | Series A Participating Preferred Stock                                    
Class Of Stock [Line Items]                                    
Preferred stock, Shares authorized                           1,000,000 1,000,000      
Issuance of preferred stock, shares                           0 0      
Preferred stock, Shares outstanding                           0 0      
Preferred Stock [Member] | Series B Preferred Stock [Member]                                    
Class Of Stock [Line Items]                                    
Preferred stock, Shares authorized                           5,000,000 5,000,000      
Preferred stock, Par value per share | $ / shares                           $ 0.01 $ 0.01      
Issuance of preferred stock, shares                           2,600,000 2,600,000      
Preferred stock, Shares outstanding                           2,600,000 2,600,000      
Shares issued price per share | $ / shares                           $ 25.00 $ 25.00      
Preferred stock liquidation preference per share | $ / shares                           $ 25.00 $ 25.00      
Preferred stock voting rights                           Holders of Series B Preferred Shares have no voting rights other than the ability, subject to certain exceptions, to elect one director if dividends for six quarterly dividend periods (whether or not consecutive) are in arrears and certain other limited protective voting rights.        
Preferred stock dividend rate percentage                           8.875%        
Preferred stock dividend rate per dollar amount | $ / shares                           $ 2.21875        
Preferred stock, Redemption price per share | $ / shares                           $ 25.00        
Preferred Stock [Member] | Series C Preferred Stock [Member]                                    
Class Of Stock [Line Items]                                    
Preferred stock, Shares authorized                           10,675 10,675      
Issuance of preferred stock, shares                           10,675 10,675      
Preferred stock, Shares outstanding                           10,675 10,675      
Shares issued price per share | $ / shares                           $ 0.01 $ 0.01      
Preferred stock voting rights                           The Series C Preferred Stock votes with the common shares of the Company, and each share entitles the holder thereof to 1,000 votes on all matters submitted to a vote of the shareholders of the Company.        
Preferred stock number of voting rights                           1,000        
Preferred Stock [Member] | Series D Preferred Stock [Member]                                    
Class Of Stock [Line Items]                                    
Preferred stock, Shares authorized                           400 400      
Preferred Stock [Member] | Series D Preferred Stock [Member] | Mrs. Semiramis Paliou                                    
Class Of Stock [Line Items]                                    
Preferred stock, Par value per share | $ / shares                           $ 0.01 $ 0.01      
Issuance of preferred stock, shares                           400 400      
Preferred stock, Shares outstanding                           400 400      
Preferred stock voting rights                           The Series D Preferred Stock vote with the common shares of the Company, and each share of the Series D Preferred Stock entitles the holder thereof to up to 200,000        
Preferred stock number of voting rights | Item                           200,000        
Percent of total number of votes entitled to vote on any matter put to shareholders                           36.00%        
Percent of total number of votes entitled to be cast on matters out to shareholders                           36.00%        
Common Stock [Member]                                    
Class Of Stock [Line Items]                                    
Issuance of new shares                           9,837,680 6,628,493 877,581    
Stock repurchased shares                               820,000    
Shares repurchase price per share | $ / shares                               $ 4.56    
Payments for repurchase of common stock | $                               $ 3,799,000    
Issuance of stock | $                           $ 98,000 $ 66,000 $ 9,000    
Issuance of common stock for vessel acquisitions, shares (Notes 6 and 11(e))                             2,033,613 16,453,780    
Common Stock [Member] | Vessel Acquisitions [Member]                                    
Class Of Stock [Line Items]                                    
Issuance of new shares                             2,033,613 16,453,780    
Shares issued price per share | $ / shares                             $ 3.84 $ 4.13    
Proceeds from issuance of stock, net of expenses | $                             $ 0 $ 0    
Number of vessels acquired | Vessels                               8    
Common Stock [Member] | ATM Program [Member]                                    
Class Of Stock [Line Items]                                    
Issuance of new shares                               877,581    
Shares issued price per share | $ / shares                               $ 6.27    
Issuance of stock | $                               $ 5,322,000    
Warrant [Member]                                    
Class Of Stock [Line Items]                                    
Number of warrants exercised                             0      
Number of warrants outstanding                                   22,613,070
Number of shares permitted to purchase from warrants                                   1
Price per share | $ / shares                                   $ 4
Warrant liability | $                           1,802,000 $ 6,332,000      
Gain on warrants | $                           $ (719,000) $ (1,583,000)