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Note 5 - Loans and the Allowance for Credit Losses - Reversal of Accrued Interest (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Interest income reversed | $ 465,000 | $ 147,000 | $ 246,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Interest income reversed | 36,000 | 15,000 | 7,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |
Interest income reversed | 381,000 | 29,000 | 153,000
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] |  |  |
Interest income reversed | 10,000 | 52,000 | 38,000
Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |  |
Interest income reversed | 1,000 | 9,000 | 0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] |  |  |
Interest income reversed | 18,000 | 14,000 | 6,000
Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |  |
Interest income reversed | 16,000 | 26,000 | 40,000
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |
Interest income reversed | $ 3,000 | $ 2,000 | $ 2,000

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- Definition Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3D -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3D + Details
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