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Note 4 - Loans and the Allowance for Credit Losses - Financial Effect of Loan Modifications (Details) | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Weighted average term extension (Month) | 5 months 18 days |  | 5 months 9 days | 7 months 6 days
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |  |
Weighted average term extension (Month) | 5 months | 6 months | 5 months 9 days | 7 months 9 days
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |  |
Weighted average term extension (Month) |  |  |  | 6 months
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] |  |  |  |
Weighted average term extension (Month) | 24 months |  | 4 months 27 days |

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- Definition Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12A -Publisher FASB -URI https://asc.fasb.org/1943274/2147481933/310-10-55-12A + Details
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