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Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($) | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Jan. 01, 2023 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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 |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance | $ 6,772,000 |  | $ 6,083,000 | $ 6,625,000 | $ 5,061,000
Subsequent Event [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member] |  |  |  |  |
Financing Receivable, Allowance for Credit Loss, Ending Balance |  | $ 700,000 |  |  |
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 |  |  |  |
Maximum [Member] |  |  |  |  |
Maturity of Time Deposits (Day) | 90 days |  |  |  |

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