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Note 9 - Fair Value Measurement - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Collateral dependent loans, fair value | $ 1,204 |
Total, fair value | 114 |
Commercial Loans [Member] |  |
Collateral dependent loans, fair value | 55 | $ 24
Agricultural Loans [Member] |  |
Collateral dependent loans, fair value | 1,149 |
Real Estate Loan [Member] | Residential Portfolio Segment [Member] |  |
RE – Residential, fair value | 91 | 91
Equity Lines of Credit [Member] | Residential Portfolio Segment [Member] |  |
Equity lines of credit, fair value | 23 |
Fair Value, Inputs, Level 3 [Member] |  |
Collateral dependent loans, fair value | 1,204 |
Total, fair value | 114 |
Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] |  |
Collateral dependent loans, fair value | 55 | 24
Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] |  |
Collateral dependent loans, fair value | 1,149 |
Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member] |  |
RE – Residential, fair value | 91 | 91
Fair Value, Inputs, Level 3 [Member] | Equity Lines of Credit [Member] | Residential Portfolio Segment [Member] |  |
Equity lines of credit, fair value | 23 |
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] |  |
Collateral dependent loans, fair value | 1,204 | 24
Total, fair value | 114 | 91
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] |  |
Collateral dependent loans, fair value | $ 55 | $ 24
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Minimum [Member] |  |
Collateral dependent loans, measurement input | 0.37 |
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Maximum [Member] |  |
Collateral dependent loans, measurement input | 1 |
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member] |  |
Collateral dependent loans, measurement input | 0.78 | 0.53
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] |  |
Collateral dependent loans, fair value | $ 1,149 | $ 0
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Minimum [Member] |  |
Collateral dependent loans, measurement input | 0.02 |
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Maximum [Member] |  |
Collateral dependent loans, measurement input | 0.98 |
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member] |  |
Collateral dependent loans, measurement input | 0.44 |
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member] |  |
RE – Residential, fair value | $ 91 | $ 91
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member] |  |
Other Real Estate, measurement input | 0.60 | 0.60
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Lines of Credit [Member] | Residential Portfolio Segment [Member] |  |
Equity lines of credit, fair value | $ 23 | $ 0
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Lines of Credit [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member] | Residential Portfolio Segment [Member] |  |
Equity lines of credit, measurement input | 0.55 |

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