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Note 5 - Commitments and Contingencies (Details Textual) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Unused Commitments to Extend Credit | $ 275,900,000 | $ 155,400,000
Off-Balance-Sheet, Credit Loss, Liability | 831,000 | 620,000
Standby Letters of Credit [Member] |  |
Unused Commitments to Extend Credit | 1,600,000 | $ 0
Construction Loan Payable [Member] |  |
Unused Commitments to Extend Credit | $ 22,200,000 |

X
- Definition Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 460 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482454/460-10-45-1 + Details
Name: | us-gaap_OffBalanceSheetCreditLossLiability
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
Name: | us-gaap_UnusedCommitmentsToExtendCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_ShortTermDebtTypeAxis=us-gaap_ConstructionLoanPayableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |