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Long-term debt, current and non-current, textuals 3 (Details) |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 16, 2018 USD ($) | May 19, 2015 USD ($) | Dec. 19, 2014 USD ($) | Jan. 13, 2014 USD ($) | Jun. 30, 2021 USD ($) installment | Jun. 29, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  | LIBOR plus margin |
Commonwealth Bank of Australia, London Branch [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  |  | $ 9,500,000 |  |
Debt Instrument, Number of installments | installment |  |  |  |  | 32 |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  | quarterly |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 156,000 |
Debt Instrument, Balloon Payment |  |  |  |  | $ 4,500,000 |
Debt Instrument, Maturity Date |  |  |  |  | Jan. 13, 2022 |
Loan Margin Percentage |  |  |  |  | 2.25% |
BNP Paribas [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  |  | $ 53,500,000 |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  | 14 |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 1,574,000 |
Debt Instrument, Balloon Payment |  |  |  |  | $ 31,466,000 |
Debt Instrument, Maturity Date |  |  |  |  | Nov. 30, 2021 |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  | LIBOR |
Loan Margin Percentage |  |  |  |  | 2.00% |
BNP Paribas [Member] | Secured Debt [Member] | First Tranche [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt | $ 75,000,000 |  |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  | 20 |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  | quarterly |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 1,562,500 |
Debt Instrument, Balloon Payment |  |  |  |  | $ 43,750,000 |
Debt Instrument, Maturity Date |  |  |  |  | Jul. 16, 2023 |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  | LIBOR |
Loan Margin Percentage |  |  |  |  | 2.30% |
BNP Paribas [Member] | Secured Debt [Member] | Second Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  | 5 |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  | semi-annual |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 1,574,000 |
Debt Instrument, Balloon Payment |  |  |  |  | $ 23,596,000 | $ 31,466,000
Debt Instrument, Maturity Date |  |  |  |  | May 19, 2024 |
Loan Margin Percentage |  |  |  |  | 2.50% |
Nordea Bank AB, London Branch [Member] | Secured Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds From Issuance Of Secured Debt |  | $ 93,080,000 |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  | 24 |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  | quarterly |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 1,862,000 |
Debt Instrument, Balloon Payment |  |  |  |  | $ 48,402,000 |
Debt Instrument, Maturity Date |  |  |  |  | Mar. 19, 2021 |
Loan Margin Percentage |  |  |  |  | 2.10% |
Nordea Bank AB, London Branch [Member] | Secured Debt [Member] | Second Agreement [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Number of installments | installment |  |  |  |  | 8 |
Debt Instrument, Frequency of Periodic Payments |  |  |  |  | quarterly |
Debt Instrument, Periodic Payment, Principal |  |  |  |  | $ 1,862,000 |
Debt Instrument, Balloon Payment |  |  |  |  | $ 40,955,000 |
Debt Instrument, Maturity Date |  |  |  |  | Mar. 19, 2022 |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  | LIBOR |
Loan Margin Percentage |  |  |  |  | 2.25% |

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