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Capital Stock and Changes in Capital Accounts (Narrative stocks) (Details) |  |  |  | 6 Months Ended |  |  |
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Jun. 09, 2023 USD ($) $ / shares | Mar. 20, 2023 USD ($) $ / shares | Jan. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) shares $ / shares | Jun. 30, 2022 USD ($) shares | May 26, 2023 USD ($) $ / shares | Dec. 31, 2022 $ / shares shares | Jun. 22, 2021 Item
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends on preferred stock | $ |  |  |  | $ 2,884,000 | $ 2,884,000 |  |  |
Payments for repurchase of common stock | $ |  |  |  | 0 | 928,000 |  |  |
Dividend paid on common stock per share | $ / shares |  | $ 0.15 |  |  |  |  |  |
Cash dividend | $ |  | $ 15,965,000 |  |  | 38,839,000 |  |  |
Dividends on Common Stock (Note 8(f)) | $ |  |  |  | 31,931,000 |  |  |  |
Dividends Paid-in-kind | $ | $ 10,761,000 |  |  |  |  |  |  |
Issuance of stock | $ |  |  |  |  | 4,980,000 |  |  |
Dividends Paid-in-kind, per share | $ / shares | $ 0.10 |  |  |  |  |  |  |
Issuance of Common Stock, shares (Notes 8(e)) |  |  | 2,033,613 |  |  |  |  |
Series B Preferred Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Cash dividends on preferred stock | $ |  |  |  | 2,884,000 | $ 2,884,000 |  |  |
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 |  |  |  | 25,000,000 |  |  | 25,000,000 |
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 100,000 votes, on all matters submitted to a vote of the shareholders of the Company, subject to a maximum number of votes eligible to be cast by such holder derived from the Series D Preferred Shares and any other voting security of the Company held by the holder to be equal to the lesser of (i) 36% of the total number of votes entitled to vote on any matter put to shareholders of the Company and (ii) the sum of the holder’s aggregate voting power derived from securities other than the Series D Preferred Stock and 15% of the total number of votes entitled to be cast on matters put to shareholders of the Company. |  |  |  |
Preferred stock number of voting rights | Item |  |  |  |  |  |  |  | 100,000
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 put to shareholders |  |  |  | 15.00% |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Class Of Stock [Line Items] |  |  |  |  |  |  |  |
Issuance of new shares |  |  |  |  | 820,000 |  |  |
Shares issued price per share | $ / shares |  |  | $ 3.84 |  |  |  |  |
Stock repurchased shares |  |  |  |  | 191,055 |  |  |
Proceeds from issuance of stock, net of expenses | $ |  |  | $ 0 |  |  |  |  |
Issuance of stock | $ |  |  |  |  | $ 8,000 |  |  |
Issuance of Common Stock, shares (Notes 8(e)) |  |  | 2,033,613 | 2,033,613 |  |  |  |
Dividends payable amount per share | $ / shares |  |  |  |  |  | $ 0.15 |  |
Dividends payable | $ |  |  |  |  |  | $ 15,965,000 |  |

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