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Note 4 - Loans and the Allowance for Credit Losses - Balance of Nonaccrual Loans By Loan Category (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Total nonaccrual | $ 15,029 | $ 4,105
Past due 90 days or more and still accruing | 0 | 0
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Total nonaccrual | 508 | 355
Past due 90 days or more and still accruing | 0 | 0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |
Total nonaccrual | 10,540 | 567
Past due 90 days or more and still accruing | 0 | 0
Commercial Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Total nonaccrual | 1,798 | 1,579
Past due 90 days or more and still accruing | 0 | 0
Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Total nonaccrual | 0 | 0
Past due 90 days or more and still accruing | 0 | 0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Total nonaccrual | 258 | 83
Past due 90 days or more and still accruing | 0 | 0
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] |  |
Total nonaccrual | 1,090 | 650
Past due 90 days or more and still accruing | 0 | 0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |
Total nonaccrual | 823 | 792
Past due 90 days or more and still accruing | 0 | 0
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Total nonaccrual | 12 | 79
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] |  |
Nonaccrual with no allowance for credit losses | 12,739 | 4,050
Total nonaccrual | 15,029 | 4,105
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |
Nonaccrual with no allowance for credit losses | 257 | 302
Total nonaccrual | 508 | 355
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |
Nonaccrual with no allowance for credit losses | 8,501 | 567
Total nonaccrual | 10,540 | 567
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Nonaccrual with no allowance for credit losses | 1,798 | 1,579
Total nonaccrual | 1,798 | 1,579
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Commercial Portfolio Segment [Member] | Construction Loans [Member] |  |
Nonaccrual with no allowance for credit losses | 0 | 0
Total nonaccrual | 0 | 0
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Real Estate Loan [Member] |  |
Nonaccrual with no allowance for credit losses | 258 | 83
Total nonaccrual | 258 | 83
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Residential Portfolio Segment [Member] | Equity Lines of Credit [Member] |  |
Nonaccrual with no allowance for credit losses | 1,090 | 650
Total nonaccrual | 1,090 | 650
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Automobile Loan [Member] |  |
Nonaccrual with no allowance for credit losses | 823 | 792
Total nonaccrual | 823 | 792
Past due 90 days or more and still accruing | 0 | 0
Nonperforming Financial Instruments [Member] | Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Nonaccrual with no allowance for credit losses | 12 | 77
Total nonaccrual | 12 | 79
Past due 90 days or more and still accruing | $ 0 | $ 0

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