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Income Taxes (Details)	9 Months Ended
	Dec. 31, 2021
Income Taxes
Applicable tax rate as percentage of 4% of U.S. related gross transportation income	50.00%
Percentage of U.S. related gross transportation income	4.00%

X

- Definition

Represents the applicable tax rate as percentage of 4% of U.S. related gross transportation income.

+ References

No definition available.

+ Details

Name:	op_ApplicableTaxRateAsPercentageOfFourPercentageOfU.s.RelatedGrossTransportationIncome
Namespace Prefix:	op_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tax rate applied by the tax authorities on US source shipping income.

+ References

No definition available.

+ Details

Name:	op_PercentageOfU.s.RelatedGrossTransportationIncome
Namespace Prefix:	op_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration