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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2023	Jan. 01, 2023
Loan Payments Delinquency Period Beyond Which Loan is Considered Past Due (Day)	90 days
Nonaccrual Loans Performance Period (Month)	6 months
Collateral Dependent Loans, Value of Significant Properties	$ 200,000
Retained Earnings (Accumulated Deficit)	$ 88,465,000	$ 97,105,000
Unfunded Loan Commitment [Member]
Off-Balance-Sheet, Credit Loss, Liability		131,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Financing Receivable, Allowance for Credit Loss			$ 561,000
Retained Earnings (Accumulated Deficit)			(529,000)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] | Unfunded Loan Commitment [Member]
Off-Balance-Sheet, Credit Loss, Liability			$ 131,000
Bank Overdrafts [Member]
Financing Receivable, Threshold Period Past Due, Writeoff (Day)	45 days
Consumer Portfolio Segment [Member]
Financing Receivable, Threshold Period Past Due, Writeoff (Day)	90 days
Accrued Interest Receivable [Member]
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss		2,400,000
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss		18,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss		$ 2,300,000
Maximum [Member]
Maturity of Time Deposits (Day)		90 days

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