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Note 9 - Borrowing Arrangements (Details Textual) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Jan. 25, 2022
Federal Home Loan Bank Stock |  |  | $ 8,084,000 | $ 6,234,000 |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss |  |  | 491,490,000 | 473,433,000 |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest |  |  | 476,595,000 | 437,735,000 |  |
Loan Agreement and Promissory Note [Member] |  |  |  |  |  |
Debt Instrument, Covenant, Maximum Debt Outstanding |  |  |  |  |  | $ 15,000,000
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  |  | 3.85%
Debt Instrument, Loan Fee |  |  |  |  |  | $ 187,500
Proceeds from Issuance of Debt | $ 5,000,000 | $ 10,000,000 |  |  |  |
Long-Term Debt |  |  | 15,000,000 |  |  |
Interest Expense, Debt |  |  | 585,000 | 641,000 | $ 369,000 |
Lender Bank One [Member] |  |  |  |  |  |
Unsecured Short-term Borrowing Agreement, Amount Available for Borrowing |  |  | 50,000,000 |  |  |
Lender Bank Two [Member] |  |  |  |  |  |
Unsecured Short-term Borrowing Agreement, Amount Available for Borrowing |  |  | 20,000,000 |  |  |
Lender Banks [Member] |  |  |  |  |  |
Short-Term Debt |  |  | 0 | 0 |  |
Asset Pledged as Collateral [Member] | Federal Reserve Bank Discount Window Program [Member] |  |  |  |  |  |
Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, before Allowance for Credit Loss |  |  | 45,639,000 |  |  |
Debt Securities, Available-for-Sale, Excluding Accrued Interest |  |  | 40,682,000 |  |  |
Line of Credit [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  | $ 15,000,000
Federal Reserve Bank Advances [Member] | Federal Reserve Bank Discount Window Program [Member] |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | 39,000,000 |  |  |
Short-Term Debt |  |  | 0 | $ 0 |  |
Federal Home Loan Bank of San Francisco [Member] |  |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available |  |  | 400,000,000 |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  |  | 659,000,000 |  |  |
Federal Home Loan Bank Stock |  |  | 8,800,000 |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds |  |  | 326,000,000 |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Stock Needed to Reach Maximum Amount |  |  | $ 2,000,000 |  |  |

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