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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

Name:	us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=us-gaap_CatastropheMember
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

Name:	us-gaap_LiabilityForCatastropheClaimsByCatastrophicEventAxis=plmr_UsHurricaneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: