Note 8 - Commitments and Contingent Liabilities (Details Textual) - USD ($)	9 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Investment, Proportional Amortization Method, Elected, Amount	$ 3,700,000		$ 1,800,000
Investment Program, Proportional Amortization Method, Applied, Amortization Expense	160,000	$ 80,000
Investment Program, Proportional Amortization Method, Elected, Commitment	$ 2,400,000		$ 1,500,000
Investment, Proportional Amortization Method, Elected, Statement of Financial Position [Extensible Enumeration]	Interest Receivable and Other Assets		Interest Receivable and Other Assets
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Noninterest Expense	Other Noninterest Expense
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration]	Depreciation, Amortization and Accretion, Net	Depreciation, Amortization and Accretion, Net

Amount of investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, investment under program not meeting condition for accounting under proportional amortization method.

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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

Amount of amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-Section 50
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Indicates line item in statement of cash flows that includes amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org/1943274/2147478156/740-323-50-1A

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Indicates line item in statement of income or comprehensive income that includes amortization expense for investment that generates income tax credit and other income tax benefit under tax credit program accounted for using proportional amortization method.

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 323
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-Subparagraph (b)
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Amount of commitment and contingent commitment, including amount of delayed equity contribution, for investment that generates income tax credit and other income tax benefit under tax credit program elected to be accounted for using proportional amortization method. Includes, but is not limited to, commitment and contingent commitment related to investment under tax credit program not meeting condition for accounting under proportional amortization method.

+ References

Reference 1: http://www.xbrl.org/2003/role/recommendedDisclosureRef
-Topic 740
-SubTopic 323
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