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Note 5 - Loans and the Allowance for Credit Losses - Financial Effect of Loan Modifications (Details) | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Weighted average term extension (Month) | 5 months 15 days | 10 months 21 days | 8 months 12 days
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Weighted average term extension (Month) | 4 months 24 days | 58 months 9 days | 6 months
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |
Weighted average term extension (Month) | 5 months 18 days | 6 months 3 days | 9 months

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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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