Income Taxes (Details)	12 Months Ended
Dec. 31, 2021
Income Taxes [Abstract]
Federal tax rate on U.S. source shipping income	4.00%
Percentage of gross income subject to tax	50.00%
Minimum stock ownership percentage for tax exemption	50.00%

The percentage of the value of the Company's common stock that is owned, directly or indirectly, by "qualified shareholders".

No definition available.

Name:	pshg_MinimumStockOwnershipPercentageForTaxExemption
Namespace Prefix:	pshg_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant