Represents the amount agreed to be paid for each vessel.

No definition available.

Name:	op_AmountAgreedToBePaidForEachVessel
Namespace Prefix:	op_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the threshold term for termination of agreement with prior written notice.

+ References

No definition available.

+ Details

Name:	op_ThresholdTermForTerminationOfAgreementWithPriorWrittenNotice
Namespace Prefix:	op_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of variable fee on hire and on freight.

+ References

No definition available.

+ Details

Name:	op_VariableFeeOnHireAndOnFreight
Namespace Prefix:	op_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=124359900&loc=SL124442552-122756

+ Details

Name:	us-gaap_DueToRelatedPartiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionExpensesFromTransactionsWithRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=op_DianaWilhelmsenManagementLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=op_ManagementFeesToRelatedPartyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_IncomeStatementLocationAxis=op_VoyageExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=op_ManagementServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=op_IfVesselIsEmployedOrAvailableForEmploymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=op_IfVesselIsLaidUpAndNotAvailableForEmploymentFor15CalendarDaysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Transactions with related parties - DWM (Details) - USD ($)			3 Months Ended	6 Months Ended
	Mar. 01, 2022	Nov. 29, 2021	Jun. 30, 2021	Jun. 30, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Management fees				$ 411,000
Due to related parties				210,000	$ 59,000
Diana Wilhelmsen Management Limited \| Management fees to related party
Related Party Transaction [Line Items]
Management fees				342,000
Diana Wilhelmsen Management Limited \| Voyage expenses
Related Party Transaction [Line Items]
Management fees				102,000
Diana Wilhelmsen Management Limited \| Management services
Related Party Transaction [Line Items]
Variable fee on hire and on freight		1.25%
Threshold term for termination of agreement with prior written notice		3 months
Management fees			$ 0	444,000
Due to related parties				$ 2,000	$ 6,000
Diana Wilhelmsen Management Limited \| Monthly fee if vessel is employed or available for employment
Related Party Transaction [Line Items]
Management fees	$ 18,500
Diana Wilhelmsen Management Limited \| Monthly fee if vessel is employed or available for employment \| Management services
Related Party Transaction [Line Items]
Amount agreed to be paid for each vessel		$ 20,000
Diana Wilhelmsen Management Limited \| Monthly fee if vessel is laid-up and not available for employment for at least 15 calendar days of such month
Related Party Transaction [Line Items]
Management fees	$ 9,250
Diana Wilhelmsen Management Limited \| Monthly fee if vessel is laid-up and not available for employment for at least 15 calendar days of such month \| Management services
Related Party Transaction [Line Items]
Amount agreed to be paid for each vessel		$ 10,000