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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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