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Note 10 - Reserve for Losses and Loss Adjustment Expenses (Details Textual) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Insurance [Abstract] |  |  |
Loss and Loss Adjustment Expense Reserve Redundancy | $ 19.8 | $ 3.0 | $ 2.2

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