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Long-term debt (Narrative II) (Details) |  |  |  |  |  |  | 1 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 27, 2023 USD ($) | Sep. 30, 2022 USD ($) Vessels | Jul. 29, 2021 USD ($) | Jul. 16, 2018 USD ($) | Mar. 19, 2015 USD ($) | Dec. 19, 2014 USD ($) | Apr. 30, 2023 USD ($) | Feb. 28, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jul. 31, 2022 USD ($) | Jun. 30, 2023 USD ($) Item | Jun. 30, 2022 USD ($) | Jun. 20, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan expenses and other |  |  |  |  |  |  |  |  |  |  | $ 203,000 | $ 115,000 |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | (748,000) | $ 0 |
Total debt outstanding |  |  |  |  |  |  |  |  | $ 530,120,000 |  | 542,849,000 |  |
BNP Paribas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of secured loan agreement |  |  |  |  |  |  | $ 75,193,000 |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ (107,000) |  |  |  |  |  |
BNP Paribas [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  | $ 53,500,000 |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | 1,574,000 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 23,596,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  | Nov. 30, 2021 |  |  |  |  | May 19, 2024 |  |
BNP Paribas [Member] | Secured Debt [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.50% |  |
BNP Paribas [Member] | Secured Debt [Member] | Second Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  | $ 75,000,000 |  |  |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 1,562,500 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 43,750,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Jul. 17, 2023 |  |
BNP Paribas [Member] | Secured Debt [Member] | Second Agreement [Member] | LIBOR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.30% |  |
Nordea Bank AB, London Branch [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt | $ 22,500,000 |  | $ 460,000 |  | $ 93,080,000 |  |  |  |  |  |  |  |
Debt Instrument, Number of installments | Item |  |  |  |  |  |  |  |  |  |  | 20 |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 1,125,000 |  |
Debt Instrument, Maturity Date |  |  |  |  | Mar. 19, 2021 |  |  |  |  |  | Jun. 27, 2028 |  |
Repayment of secured loan agreement | 20,934,000 |  |  |  |  |  |  | $ 8,134,000 |  | $ 4,786,000 |  |  |
Loss on extinguishment of debt | $ (220,000) |  |  |  |  |  |  |  |  |  |  |  |
Total debt outstanding |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,934,000
Nordea Bank AB, London Branch [Member] | Secured Debt [Member] | SOFR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.25% |  |
Nordea Bank AB, London Branch [Member] | Secured Debt [Member] | Loan Agreement - 9 Ultramax Vessels [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  | $ 197,236,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 3,719,000 |  |
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 100,912,000 |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Oct. 11, 2027 |  |
Repayment of secured loan agreement |  |  |  |  |  |  |  |  | $ 21,937,000 |  |  |  |
Debt Instrument, Face Amount |  | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |
Number Of Vessels Financed | Vessels |  | 9 |  |  |  |  |  |  |  |  |  |  |
Nordea Bank AB, London Branch [Member] | Secured Debt [Member] | Loan Agreement - 9 Ultramax Vessels [Member] | SOFR [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.25% |  |

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