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Fair Value measurements and Risk management (Details) - Revenue Benchmark - Customer Concentration Risk [Member] - OceanPal Inc. Predecessors | 6 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Nov. 29, 2021 | Dec. 31, 2020 | Dec. 31, 2019
C Transport Maritime LTD |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 37.00% |  | 38.00% |  |
Vitera Chartering |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 28.00% |  | 29.00% |  |
Reachy International |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage | 25.00% |  | 28.00% |  |
Cargill International S.A. |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  | 37.00% |  | 34.00% |
Phaethon International Co AG. |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  | 33.00% |  | 34.00% |
Uniper Global Commodities, Dusseldorf GE |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  | 11.00% |  | 22.00% |
Crystal Sea Shipping Co., Limited |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  | 20.00% |  | 10.00% | 12.00%
Hadson Shipping Lines Inc. |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 30.00%
Glencore Agriculture BV |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 22.00%

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