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Commitments and contingencies (Details) € in Millions | Dec. 31, 2021 EUR (€) € / $ | Dec. 31, 2021 USD ($) € / $
--- | --- | ---
Commitments Under Long-Term Lease Contracts [Abstract] |  |
2022 |  | $ 25,772,380
Total |  | 25,772,380
Purchase Commitment for Ballast Water Management Systems [Member] |  |
Commitments Under Contracts for BWMS Installation [Abstract] |  |
Contractual purchase obligations | € 3.0 | $ 3,400,000
Exchange rate | € / $ | 1.1324 | 1.1324
Contractual purchase obligations due in 2022 | € 2.4 | $ 2,700,000
Contractual purchase obligations due in 2023 | € 0.6 | $ 700,000

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