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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Income Statement [Abstract]
Non-recurring fee income received	$ 0.1	$ 0.1	$ 0.3	$ 0.1

X

- Definition

Non-recurring fee income received.

+ References

No definition available.

+ Details

Name:	ptmn_NonRecurringFeeIncomeReceived
Namespace Prefix:	ptmn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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