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Note 1 - The Business of Plumas Bancorp (Details Textual)	Jul. 01, 2025	Sep. 30, 2025
Number of Branches		3
Cornerstone Community Bancorp [Member]
Number of Branches Acquired	4
CALIFORNIA
Number of Branches		17
Anderson, CA [Member] | Cornerstone Community Bancorp [Member]
Number of Branches Acquired	1
Red Bluff, CA [Member] | Cornerstone Community Bancorp [Member]
Number of Branches Acquired	1
Redding, CA [Member] | Cornerstone Community Bancorp [Member]
Number of Branches Acquired	2

X

- Definition

Represents the number of branches operated by a bank.

+ References

No definition available.

+ Details

Name:	plbc_NumberOfBranches
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of branches acquired.

+ References

No definition available.

+ Details

Name:	plbc_NumberOfBranchesAcquired
Namespace Prefix:	plbc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=plbc_CornerstoneCommunityBancorpMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=stpr_CA
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=plbc_AndersonCAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=plbc_RedBluffCAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=plbc_ReddingCAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: