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Note 4 - Loans (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Jan. 01, 2023 | Dec. 31, 2022
Financing Receivable, Accrued Interest, after Allowance for Credit Loss | $ 3,680,000 |  | $ 3,680,000 |  |  |  |  |  |
Underwriting Standards, Loan to Value Percentage | 80.00% |  | 80.00% |  |  |  |  |  |
Underwriting Standards, Housing Percentage | 36.00% |  | 36.00% |  |  |  |  |  |
Underwriting Standards, Total Debt Ratio | 42.00% |  | 42.00% |  |  |  |  |  |
Financing Receivable, Nonaccrual | $ 0 |  | $ 0 |  |  | $ 0 |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | $ 1,075,138,000 |  | $ 1,075,138,000 |  |  | 1,016,579,000 |  |  |
Financing Receivable, Minimum Cash Collateral Percent | 110.00% |  | 110.00% |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 11,479,000 | $ 9,738,000 | $ 11,479,000 | $ 9,738,000 | $ 11,121,000 | 10,896,000 | $ 9,411,000 |  | $ 9,468,000
Financing Receivable, Allowance for Credit Loss, Recovery | 1,992,000 | 38,000 | 2,242,000 | 124,000 |  |  |  |  |
(Reversal of) provision for credit losses | (1,620,000) | 300,000 | (1,620,000) | (160,000) |  |  |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged | 1,075,136,000 |  | 1,075,136,000 |  |  | 1,016,579,000 |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  |  |  |  |  |  | 346,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  |  |  |  |  | $ 346,000 |
Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | 0 |  | 0 |  |  | 0 |  |  |
Collateral Pledged [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | $ 0 |  | $ 0 |  |  | 0 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans | 86.00% |  | 86.00% |  |  |  |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans | 8.00% |  | 8.00% |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | $ 81,439,000 |  | $ 81,439,000 |  |  | 65,218,000 |  |  |
Financing Receivable, Allowance for Credit Loss | 895,000 | 527,000 | 895,000 | 527,000 | 1,177,000 | 650,000 | 600,000 |  | 612,000
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 0 | 0 | 12,000 |  |  |  |  |
(Reversal of) provision for credit losses | $ (282,000) | (73,000) | $ 245,000 | (187,000) |  |  |  |  |
Commercial Portfolio Segment [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  |  |  |  |  |  | 102,000
Residential Real Estate and Other Consumer Loans [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans | 3.00% |  | 3.00% |  |  |  |  |  |
Agriculture [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Gross Carrying Amount As Percentage of Total Loans | 3.00% |  | 3.00% |  |  |  |  |  |
Financing Receivable, before Allowance for Credit Loss, Fee and Loan in Process | $ 30,776,000 |  | $ 30,776,000 |  |  | 25,922,000 |  |  |
Financing Receivable, Allowance for Credit Loss | 105,000 | 38,000 | 105,000 | 38,000 | $ 101,000 | $ 47,000 | $ 39,000 |  | 172,000
Financing Receivable, Allowance for Credit Loss, Recovery | 0 | 0 | 0 | 0 |  |  |  |  |
(Reversal of) provision for credit losses | $ 4,000 | $ (1,000) | $ 58,000 | $ 3,000 |  |  |  |  |
Agriculture [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |  |
Financing Receivable, Allowance for Credit Loss |  |  |  |  |  |  |  |  | $ (137,000)

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