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Note 1 - Basis of Presentation (Details Textual) | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Number of Operating Segments | 1 |  |  |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | $ 1,270,000 |  |  |  |  |
Minimum Principal Balance of Loans for Quarterly Rating Review | 500,000 |  |  |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | 8,910,000 |  | $ 7,940,000 |  |  |
Off-Balance-Sheet, Credit Loss, Liability | 964,000 | $ 964,000 | $ 1,196,000 | $ 956,000 | $ 776,000 | $ 678,000
Other Liabilities [Member] |  |  |  |  |  |
Off-Balance-Sheet, Credit Loss, Liability | $ 964,000 |  |  |  |  |

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