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Note 10 - Reinsurance (Details Textual) - USD ($) $ in Millions | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2022
Reinsurance Retention [Line Items] |  |  |  |
Reinsurance, Amount Retained, Per Event | $ 1.5 |  |  |
Reinsurance Policy, Excess of Loss Protection Amount | 735.0 |  |  |
Catastrophe Bond, Face Value | 525.0 | $ 420.0 | $ 200.0 | $ 275.0
Earthquake [Member] |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Reinsurance, Amount Retained, Per Event | 20.0 |  |  |
Reinsurance Policy, Excess of Loss Protection Amount | 3,530.0 |  |  |
U.S. Hurricane [Member] |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Reinsurance Policy, Excess of Loss Protection Amount | 100.0 |  |  |
Continental Hurricane [Member] |  |  |  |
Reinsurance Retention [Line Items] |  |  |  |
Reinsurance, Amount Retained, Per Event | $ 11.0 |  |  |

X
- Definition Fair value amount of catastrophe bond. + References No definition available. + Details
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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
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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
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + 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
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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