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Note 1 - Basis of Presentation and Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Number of Operating Segments | 1 |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | $ 694,000 | $ 1,250,000 |
Minimum Principal Balance of Loans for Quarterly Rating Review | 500,000 |  |
Off-Balance-Sheet, Credit Loss, Liability | $ 341,000 | 746,000 | $ 1,196,000
Lessee, Operating Lease, Term of Contract (Year) | 10 years |  |
Number of Reportable Segments | 1 |  |
Goodwill, Impairment Loss | $ 0 | $ 0 |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Interest Receivable | Interest Receivable |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 10 years |  |
Equipment, Computer Hardware and Software [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 3 years |  |
Equipment, Computer Hardware and Software [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 5 years |  |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 7 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 40 years |  |
Land and Land Improvements [Member] |  |  |
Property, Plant and Equipment, Useful Life (Year) | 20 years |  |
Other Assets [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Amount | $ 3,620,000 | $ 3,700,000 |
Other Liabilities [Member] |  |  |
Off-Balance-Sheet, Credit Loss, Liability | 341,000 | 746,000 |
Investment in Federal Home Loan Bank (FHLB) and Federal Reserve Bank (FRB) Stock [Member] | Other Assets [Member] |  |  |
Investment Owned, Cost | $ 12,780,000 | $ 13,040,000.00 |

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