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Long-term debt, current and non-current, textuals 4 (Details) |  |  |  |  |  |  |  |  |  |  | 6 Months Ended
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May 21, 2021 USD ($) | May 20, 2021 USD ($) | May 22, 2020 USD ($) | Jun. 27, 2019 USD ($) | Mar. 14, 2019 USD ($) | Jan. 04, 2017 USD ($) | Nov. 19, 2015 USD ($) | Oct. 06, 2015 USD ($) | Apr. 30, 2015 USD ($) | Mar. 30, 2015 USD ($) | Jun. 30, 2021 USD ($) installment
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR plus margin
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt | $ 91,000,000 |  |  |  |  |  |  |  |  | $ 50,160,000 |
Debt Instrument, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 24
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 994,000
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 26,310,000
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | May 20, 2026
Debt Instrument, Description of Variable Rate Basis |  | LIBOR |  |  |  |  |  |  |  |  | LIBOR
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.00%
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | Term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  | $ 52,885,000 |  |  |  |  |  |  |  |
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | First Tranche [Member] | Term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Jun. 30, 2024
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.25%
ABN AMRO Bank N.V. [Member] | Secured Debt [Member] | Second Tranche [Member] | Term loan facility |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Mar. 30, 2021
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR
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 |  |  |  | $ 25,000,000 |  |  |  |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 20
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly
Debt Instrument, Periodic Payment, Principal |  | $ 3,390,000 |  | $ 800,000 |  |  |  |  |  |  |
Debt Instrument, Balloon Payment |  | $ 23,200,000 |  |  |  |  |  |  |  |  | $ 9,000,000
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR
Loan Margin Percentage |  | 2.15% |  |  |  |  |  |  |  |  | 2.25%
Danish Ship FInance A/S [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  |  |  |  | $ 30,000,000 |  |
Debt Instrument, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 28
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 500,000
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 16,000,000
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Apr. 30, 2022
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 2.15%
ING Bank N.V. [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR
Loan Margin Percentage |  |  |  |  |  |  |  |  |  |  | 1.65%
ING Bank N.V. [Member] | Secured Debt [Member] | First Tranche [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  |  | $ 27,950,000 |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 28
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 466,000
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 14,907,000
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Nov. 19, 2022
ING Bank N.V. [Member] | Secured Debt [Member] | Second Tranche [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  |  |  | $ 11,733,000 |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 28
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 293,000
Debt Instrument, Balloon Payment |  |  |  |  |  |  |  |  |  |  | $ 3,520,000
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  | Oct. 06, 2022
Export-Import Bank of China [Member] | Secured Debt [Member] |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  |  |  | $ 57,240,000 |  |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 60
Debt Instrument, Frequency of Periodic Payments |  |  |  |  |  |  |  |  |  |  | quarterly
Debt Instrument, Periodic Payment, Principal |  |  |  |  |  |  |  |  |  |  | $ 954,000
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  | LIBOR
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, Number of installments | installment |  |  |  |  |  |  |  |  |  |  | 20
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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