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Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Statement [Abstract]
Non-recurring fee income received	$ 0.1	$ 0.1	$ 0.6

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