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Note 2 - Recent Accounting Pronouncements (Details Textual) - USD ($) | Sep. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Retained Earnings (Accumulated Deficit) | $ 94,899,000 |  | $ 88,465,000
Accrued Interest Receivable [Member] |  |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | 2,100,000 |  |
Unfunded Loan Commitment [Member] |  |  |
Off-Balance-Sheet, Credit Loss, Liability | 131,000 |  |
Debt Securities, Available-for-Sale [Member] | Debt Securities, Held-to-Maturity [Member] |  |  |
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss | 2,100,000 |  |
Debt Securities, Held-to-Maturity [Member] | Debt Securities, Held-to-Maturity [Member] |  |  |
Debt Securities, Held-to-Maturity, Accrued Interest, after Allowance for Credit Loss | $ 18,000 |  |
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 |

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