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Note 10 - Reinsurance (Details Textual) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2021
Catastrophe Bond, Face Value |  | $ 200.0 | $ 275.0 | $ 400.0
Catastrophe [Member] |  |  |  |
Reinsurance, Amount Retained, Per Event | $ 17.5 |  |  |
Earthquake [Member] |  |  |  |
Reinsurance Policy, Excess of Loss Protection Amount | 2,680.0 |  |  |
Hawaii Hurricane [Member] |  |  |  |
Reinsurance Policy, Excess of Loss Protection Amount | 900.0 |  |  |
U.S. Hurricane [Member] |  |  |  |
Reinsurance Policy, Excess of Loss Protection Amount | $ 100.0 |  |  |

X
- Definition Fair value amount of catastrophe bond. + References No definition available. + Details
Name: | plmr_CatastropheBondFaceValue
Namespace Prefix: | plmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Excess of loss protection amount of reinsurance policy. + References No definition available. + Details
Name: | plmr_ReinsurancePolicyExcessOfLossProtectionAmount
Namespace Prefix: | plmr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount per event of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-3 + Details
Name: | us-gaap_ReinsuranceRetentionAmountRetainedPerEvent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_EarthquakeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=plmr_HawaiiHurricaneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |