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Note 4 - Reserve for Losses and Loss Adjustment Expenses (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Insurance [Abstract]
Loss and Loss Adjustment Expense Reserve Redundancy	$ 6.1	$ 0.2	$ 17.0	$ 2.6

X

- Definition

Represents the amount of loss and loss adjustment expense reserve redundancy.

+ References

No definition available.

+ Details

Name:	plmr_LossAndLossAdjustmentExpenseReserveRedundancy
Namespace Prefix:	plmr_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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