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Note 4 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Jan. 01, 2023
Off-balance-sheet Commitments to Related Parties	$ 2,100,000	$ 2,600,000
Financing Receivable, Nonaccrual, Interest Income	0	0
Financing Receivable, Modified in Period, Amount		0	$ 0
Financing Receivable, Modified, Subsequent Default	0	0
Financing Receivable, Modified, Commitment to Lend	0	0
Financing Receivables, Troubled Debt Restructuring, Write-down			$ 0
Unfunded Loan Commitment [Member]
Off-Balance-Sheet, Credit Loss, Liability				$ 131,000
Off-Balance-Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal)	0	$ 0
Commercial Business [Member]
Financing Receivable, Modified in Period, Amount	$ 2,000,000
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage	3.00%
Financing Receivable Modification, Increase (Decrease) from Modification	$ 0
Financing Receivable, Modified, Payment Deferral, Period	0 years
Financing Receivable, Modified, Weighted Average Interest Rate Decrease from Modification	0.00%

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Period of payment deferral of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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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.

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