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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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