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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