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Note 5 - Loans and the Allowance for Credit Losses - Loan Modifications (Details) - Extended Maturity [Member] - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Modified | $ 7,215 | $ 10,999 | $ 7,246
% of total segment financing receivables | 0.48% | 1.08% | 0.75%
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Modified | $ 844 | $ 982 | $ 1,531
% of total segment financing receivables | 0.08% | 1.26% | 2.04%
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |
Modified | $ 6,371 | $ 10,017 | $ 5,715
% of total segment financing receivables | 4.04% | 8.41% | 4.41%

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- Definition Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
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- Definition Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-42 + Details
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- Details
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