No definition available.

Amount of ground lease expense.

No definition available.

Amount of ground lease expense in after fifth fiscal year following the latest fiscal year.

No definition available.

Name:	pstl_GroundLeaseExpenseAfterYearFive
Namespace Prefix:	pstl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of ground lease expense in the next fiscal year following the latest fiscal year.

No definition available.

Name:	pstl_GroundLeaseExpenseNextTwelveMonths
Namespace Prefix:	pstl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of ground lease expense remainder of fiscal year.

No definition available.

Name:	pstl_GroundLeaseExpenseRemainderOfFiscalYear
Namespace Prefix:	pstl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of ground lease expense in fourth fiscal year following the latest fiscal year.

No definition available.

Name:	pstl_GroundLeaseExpenseYearFour
Namespace Prefix:	pstl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of ground lease expense in third fiscal year following the latest fiscal year.

No definition available.

Name:	pstl_GroundLeaseExpenseYearThree
Namespace Prefix:	pstl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of ground lease expense in second fiscal year following the latest fiscal year.

No definition available.

Name:	pstl_GroundLeaseExpenseYearTwo
Namespace Prefix:	pstl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant