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Note 9 - Fair Value Measurement - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Collateral dependent loans, fair value | $ 1,204 |  |
Collateral depended loans, total loss | 1,040 | $ 0 |
Collateral depended loans, total loss |  | $ 0 |
Total, fair value | 114 |  |
Total, total loss | 27 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Total, fair value | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Total, fair value | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 1,204 |  |
Total, fair value | 114 |  |
Commercial Loans [Member] |  |  |
Collateral dependent loans, fair value | 55 |  | $ 24
Collateral depended loans, total loss | 150 |  |
Commercial Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  | 0
Commercial Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  | 0
Commercial Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 55 |  | 24
Agricultural Loans [Member] |  |  |
Collateral dependent loans, fair value | 1,149 |  |
Collateral depended loans, total loss | 890 |  |
Agricultural Loans [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Agricultural Loans [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Collateral dependent loans, fair value | 0 |  |
Agricultural Loans [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Collateral dependent loans, fair value | 1,149 |  |
Real Estate Loan [Member] |  |  |
Collateral depended loans, total loss | 0 |  |
Real Estate Loan [Member] | Residential Portfolio Segment [Member] |  |  |
RE – Residential, fair value | 91 |  | 91
Real Estate Loan [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
RE – Residential, fair value | 0 |  | 0
Real Estate Loan [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
RE – Residential, fair value | 0 |  | 0
Real Estate Loan [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
RE – Residential, fair value | 91 |  | $ 91
Equity Lines of Credit [Member] | Residential Portfolio Segment [Member] |  |  |
Equity lines of credit, fair value | 23 |  |
Equity lines of credit, total loss | 27 |  |
Equity Lines of Credit [Member] | Fair Value, Inputs, Level 1 [Member] | Residential Portfolio Segment [Member] |  |  |
Equity lines of credit, fair value |  |  |
Equity Lines of Credit [Member] | Fair Value, Inputs, Level 2 [Member] | Residential Portfolio Segment [Member] |  |  |
Equity lines of credit, fair value |  |  |
Equity Lines of Credit [Member] | Fair Value, Inputs, Level 3 [Member] | Residential Portfolio Segment [Member] |  |  |
Equity lines of credit, fair value | $ 23 |  |

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