Total other costs capitalized in vessel cost consisting of predelivery expenses.

No definition available.

Name:	pshg_CostsCapitalizedInVessels
Namespace Prefix:	pshg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The number of vessels acquired by the entity.

+ References

No definition available.

+ Details

Name:	pshg_NumberOfVesselsAcquired
Namespace Prefix:	pshg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

+ Details

Name:	pshg_VesselAcquisitionsAbstract
Namespace Prefix:	pshg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of noncurrent assets classified as other.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_OtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash outflow for acquisition of or capital improvements to properties held for investment (operating, managed, leased) or for use.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3213-108585

+ Details

Name:	us-gaap_PaymentsForCapitalImprovements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

+ Details

Name:	us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_StatementOperatingActivitiesSegmentAxis=us-gaap_SegmentContinuingOperationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_PFosPKikumaAndPYanbuMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_PFosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BusinessAcquisitionAxis=pshg_RongelapShippingCompanyIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_PKikumaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_PYanbuMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_BrioletteAndPFosMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_VesselsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=pshg_BlueMoonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Vessels, net, Vessel Acquisitions and Vessels' Improvements (Details)	1 Months Ended		6 Months Ended	12 Months Ended
	Jan. 31, 2020 USD ($)	Nov. 30, 2019 USD ($)	Jun. 30, 2020 Vessel	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) Vessel	Dec. 31, 2019 USD ($)
Vessel Acquisitions [Abstract]
Purchase price of the vessels				$ 8,000	$ 224,000
Number of tanker vessels acquired \| Vessel			2
Other non-current assets				819,000	0
Payments for vessels' improvements				1,777,000	0	$ 0
Continuing Operations [Member] \| P. Fos, P. Kikuma and P. Yanbu [Member]
Vessel Acquisitions [Abstract]
Pre-delivery costs capitalized					403,000
Continuing Operations [Member] \| P. Fos [Member]
Vessel Acquisitions [Abstract]
Pre-delivery costs capitalized						$ 17,000
Continuing Operations [Member] \| P. Fos [Member] \| Rongelap Shipping Company Inc [Member]
Vessel Acquisitions [Abstract]
Payment for vessels acquisition		$ 11,000,000
Purchase price of the vessels	$ 26,000,000
Continuing Operations [Member] \| P. Kikuma [Member]
Vessel Acquisitions [Abstract]
Purchase price of the vessels					26,000,000
Continuing Operations [Member] \| P. Yanbu [Member]
Vessel Acquisitions [Abstract]
Purchase price of the vessels					22,000,000
Continuing Operations [Member] \| Briolette and P. Fos [Member]
Vessel Acquisitions [Abstract]
Purchase price of the vessels				2,218,000
Payments for vessels' improvements				1,758
Continuing Operations [Member] \| Vessels [Member]
Vessel Acquisitions [Abstract]
Purchase price of the vessels				2,218,000	$ 63,386,000
Number of tanker vessels acquired \| Vessel					3
Continuing Operations [Member] \| Blue Moon [Member]
Vessel Acquisitions [Abstract]
Other non-current assets				558,000
Payments for vessels' improvements				$ 19