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Investments in Unconsolidated Joint Ventures, New 2020 Joint Venture (Details) $ in Thousands |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 22, 2021 USD ($) | Apr. 24, 2020 USD ($) Company Agreement Vessel t | Dec. 31, 2023 USD ($) Valuation | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Apr. 22, 2022 USD ($) | Dec. 10, 2020 | Mar. 31, 2020 | Mar. 12, 2020 USD ($)
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Estimated useful life of vessels |  |  | 25 years |  |  |  |  |  |
Prepayments of loan |  |  | $ 76,384 | $ 68,893 | $ 28,313 |  |  |  |
MR Seller [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Number of joint venture agreements | Agreement |  | 2 |  |  |  |  |  |  |
M/T Eco Yosemite Park and M/T Eco Joshua Park [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Term of time charter |  |  | 5 years |  |  |  |  |  |
Optional term to extend time charter |  |  | 2 years |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Number of companies owning vessels | Company |  | 2 |  |  |  |  |  |  |
Investment in unconsolidated joint venture |  | $ 27,000 |  |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | Loan Agreement with Alpha Bank [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Face amount |  |  |  |  |  |  |  |  | $ 37,660
Term of loan |  |  | 5 years |  |  |  |  |  |
Minimum market value of vessels as a percentage of amount outstanding |  |  | 200.00% |  |  |  |  |  |
Number of valuations to be performed per year | Valuation |  |  | 3 |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | Loan Agreement with Alpha Bank [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 3.00% |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | Just-C Limited [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  | 50.00% |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | MR Seller [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  | 50.00% |
California 19 Inc. and California 20 Inc. [Member] | CSI [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Commission for sale and purchase of vessels |  | $ 454 |  |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | M/T Eco Yosemite Park and M/T Eco Joshua Park [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Number of scrubber-fitted vessels owned | Vessel |  | 2 |  |  |  |  |  |  |
Dwt of scrubber-fitted vessels | t |  | 50,000 |  |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | M/T Eco Yosemite Park [Member] | Loan Agreement with Alpha Bank [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Face amount |  |  | $ 18,500 |  |  |  |  |  | 18,830
Balloon payment payable at maturity |  |  | 18,830 |  |  |  |  |  |
California 19 Inc. and California 20 Inc. [Member] | M/T Eco Joshua Park [Member] | Loan Agreement with Alpha Bank [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Face amount |  |  | 18,500 |  |  |  |  |  | $ 18,830
Balloon payment payable at maturity |  |  | $ 18,830 |  |  |  |  |  |
California 19 Inc. [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% | 50.00% | 50.00% | 50.00% |  | 50.00% |  |
Excess of purchase price over net book value of vessels |  | $ 1,646 |  |  |  |  |  |  |
Excess of fair market value over carrying value of vessels |  | $ 1,963 |  |  |  |  |  |  |
California 19 Inc. [Member] | Loan Agreement with Alpha Bank [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Prepayments of loan | $ 330 |  |  |  |  |  |  |  |
Balance outstanding |  |  |  |  |  | $ 18,500 |  |  |
California 20 Inc. [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Ownership percentage |  | 50.00% | 50.00% | 50.00% | 50.00% |  | 50.00% |  |
Excess of purchase price over net book value of vessels |  | $ 1,654 |  |  |  |  |  |  |
Excess of fair market value over carrying value of vessels |  | $ 1,963 |  |  |  |  |  |  |
California 20 Inc. [Member] | Loan Agreement with Alpha Bank [Member] |  |  |  |  |  |  |  |  |
Investments in Unconsolidated Joint Ventures [Abstract] |  |  |  |  |  |  |  |  |
Prepayments of loan | $ 330 |  |  |  |  |  |  |  |
Balance outstanding |  |  |  |  |  | $ 18,500 |  |  |

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