Note 4 - Loans and the Allowance for Credit Losses - Financial Effect of Loan Modifications (Details) |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Weighted average term extension (Month) | 7 months 21 days | 5 months 18 days | 12 months 6 days | 5 months 9 days |
| Commercial Portfolio Segment [Member] | Commercial Loans [Member] | ||||
| Weighted average term extension (Month) | 12 months | 8 months 27 days | ||
| Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | ||||
| Weighted average term extension (Month) | 12 months | 5 months | 12 months | 5 months 9 days |
| Commercial Portfolio Segment [Member] | Construction Loans [Member] | ||||
| Weighted average term extension (Month) | 8 months | 8 months | ||
| Commercial Real Estate Portfolio Segment [Member] | Commercial Loans [Member] | ||||
| Weighted average term extension (Month) | 24 months | 4 months 27 days | ||
| Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member] | ||||
| Weighted average term extension (Month) | 6 months | 17 months | ||