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Long-term debt (Narrative III)) (Details) |  |  |  |  |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 06, 2023 USD ($) | Jun. 26, 2023 USD ($) | Apr. 19, 2023 USD ($) | Mar. 14, 2023 USD ($) | Aug. 22, 2022 USD ($) | May 20, 2021 USD ($) | May 22, 2020 USD ($) | Mar. 14, 2019 USD ($) | Jan. 04, 2017 USD ($) | Jun. 30, 2023 USD ($) Installments Item | Jun. 30, 2022 USD ($) | Apr. 12, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ (748,000) | $ 0 |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  |  | $ 52,885,000 |  |  |  |  |
Repayment of secured loan agreement |  | $ 68,678,000 |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | (237,000) |  |  |  |  |  |  |  |  |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | First Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 800,000 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  | $ 9,000,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | Jun. 28, 2024 |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | First Tranche [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  | 2.25% |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 994,000 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  | $ 13,391,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | Jun. 28, 2024 |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | Second Tranche [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  | 2.40% |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | Second Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  | $ 91,000,000 |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 1,980,000 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  | $ 13,553,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | May 20, 2026 |  |
Repayment of secured loan agreement |  |  |  |  | $ 30,791,000 |  |  |  |  |  |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | Second Agreement [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  | 2.15% |  |
Debt Instrument Interest Rate Increase Decrease |  |  |  |  |  |  |  |  |  | 10.00% |  |
Export-Import Bank of China [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  |  |  |  | $ 57,240,000 |  |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 954,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | Jan. 04, 2032 |  |
Export-Import Bank of China [Member] | Secured Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  | 2.30% |  |
DNB Bank ASA [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  |  |  | $ 19,000,000 |  |  |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 477,300 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  | $ 9,454,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | Mar. 14, 2024 |  |
Repayment of secured loan agreement |  |  |  | $ 11,841,000 |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  | $ (25,000) |  |  |  |  |  |  |  |
DNB Bank ASA [Member] | Secured Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  | 2.40% |  |  |  |
DNB Bank ASA [Member] | Secured Debt [Member] | Second Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Number of installments | Item |  |  |  |  |  |  |  |  |  | 26 |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 3,846,000 |  |
Debt Instrument, Face Amount |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |
DNB Bank ASA [Member] | Secured Debt [Member] | Second Agreement [Member] | Interest Rate Swap [Member] | Subsequent Events. |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Derivative Notional Amount | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Notional amount, percent of loan | 30.00% |  |  |  |  |  |  |  |  |  |  |
Quarterly amortization amount | $ 1,154,000 |  |  |  |  |  |  |  |  |  |  |
Derivative Fixed Interest Rate | 4.268% |  |  |  |  |  |  |  |  |  |  |
DNB Bank ASA [Member] | Secured Debt [Member] | Second Agreement [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  | 2.20% |  |
Danish Ship Finance AS [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  | $ 100,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Number of installments | Installments |  |  |  |  |  |  |  |  |  | 20 |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  | $ 3,301,000 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  | $ 33,972,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  | Apr. 19, 2028 |  |
Debt Instrument, Face Amount |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000
Danish Ship Finance AS [Member] | Secured Debt [Member] | SOFR [Member] |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  | 2.20% |  |

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