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Transactions with Related Parties (Altair and Steamship) (Narrative) (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2022
Related Party Transaction [Line Items] |  |  |
Due to related parties, current | $ 195,000 |  | $ 136,000
Altair Travel Agency S.A. [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | 1,311,000 | $ 1,238,000 |
Due to related parties, current | 195,000 |  | 136,000
Steamship Shipbroking Enterprises [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Related Party Transaction, Amounts of Transaction | 1,950,000 | 1,654,000 |
Due to related parties, current | 0 |  | $ 0
Commissions charged by a related party (Note 4(d)) | $ 226,000 | $ 1,219,000 |

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