Note 5 - Loans and the Allowance for Credit Losses - Loan Modifications (Details) - Extended Maturity [Member] - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
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% |