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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
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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: |