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Long-term debt and Finance Liability, textual 3 (Details) - Secured Debt [Member] - USD ($) |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 20, 2021 | Jun. 27, 2019 | Mar. 14, 2019 | Jan. 04, 2017 | Mar. 30, 2015 | Jun. 30, 2022 | May 22, 2020
ABN AMRO Bank N.V. [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  | $ 50,160,000 |  |
Debt Instrument, Maturity Date |  |  |  |  | Mar. 30, 2021 |  |
ABN AMRO Bank N.V. [Member] | Term loan facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  |  | $ 52,885,000
ABN AMRO Bank N.V. [Member] | Sustainability linked loan facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt | $ 91,000,000 |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal | 3,390,000 |  |  |  |  |  |
Debt Instrument, Balloon Payment | $ 23,200,000 |  |  |  |  |  |
Debt Instrument, Maturity Date | May 20, 2026 |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis | LIBOR |  |  |  |  |  |
Loan Margin Percentage | 2.15% |  |  |  |  |  |
ABN AMRO Bank N.V. [Member] | First Tranche | Term loan facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  | $ 800,000 |
Debt Instrument, Balloon Payment |  |  |  |  |  | $ 9,000,000 |
Debt Instrument, Maturity Date |  |  |  |  |  | Jun. 28, 2024 |
Loan Margin Percentage |  |  |  |  |  | 2.25% |
ABN AMRO Bank N.V. [Member] | Second Tranche | Term loan facility |  |  |  |  |  |  |
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 |  |  |  |  | Mar. 30, 2021 | Jun. 28, 2024 |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  | LIBOR |
Loan Margin Percentage |  |  |  |  |  | 2.40% |
ABN AMRO Bank N.V. [Member] | Second Agreement [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  | $ 25,000,000 |  |  |  |  |
Debt Instrument, Maturity Date |  | Jun. 30, 2024 |  |  |  |  |
Export-Import Bank of China [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 |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  | LIBOR |
Loan Margin Percentage |  |  |  |  |  | 2.30% |
DNB Bank ASA [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 |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  | LIBOR |
Loan Margin Percentage |  |  |  |  |  | 2.40% |

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