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Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Collateral dependent loans, fair value | $ 1,988 |
Collateral depended loans, total loss | 1,487 | $ 1
Collateral depended loans, total loss |  | 50
Total | 226 |
Total, total loss | 0 |
Fair Value, Inputs, Level 1 [Member] |  |
Collateral dependent loans, fair value | 0 |
Total | 0 |
Fair Value, Inputs, Level 2 [Member] |  |
Collateral dependent loans, fair value | 0 |
Total | 0 |
Fair Value, Inputs, Level 3 [Member] |  |
Collateral dependent loans, fair value | 1,988 |
Total | 226 |
Commercial Loans [Member] |  |
Collateral dependent loans, fair value | 84 | 24
Collateral depended loans, total loss | 39 |
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 | 84 | 24
Agricultural Loans [Member] |  |
Collateral dependent loans, fair value | 1,904 |
Collateral depended loans, total loss | 1,448 |
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 | 1,904 |
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 | 135 |
Equity lines of credit, total loss | 0 |
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 | $ 135 |

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