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Note 8 - Fair Value - Nonrecurring Measurements Valuation Techniques (Details) | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
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Commercial Real Estate Portfolio Segment [Member] | Valuation, Income Approach [Member] |  |
Loans, fair value | $ 20,815,000 | $ 7,286
Loans, fair value | $ 20,815,000 | $ 7,286
Commercial Real Estate Portfolio Segment [Member] | Valuation, Income Approach [Member] | Minimum [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | (0.5418) | (0.5603)
Commercial Real Estate Portfolio Segment [Member] | Valuation, Income Approach [Member] | Maximum [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | 0.6463 | 0.6902
Commercial Real Estate Portfolio Segment [Member] | Valuation, Income Approach [Member] | Weighted Average [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | (0.4216) | (0.4071)
Commercial Portfolio Segment [Member] | Valuation, Market Approach [Member] |  |
Loans, fair value | $ 2,165,000 |
Loans, fair value | $ 2,165,000 |
Commercial Portfolio Segment [Member] | Valuation, Market Approach [Member] | Measurement Input, Price Volatility [Member] |  |
Loans, measurement input | 0.1009 |
Commercial Portfolio Segment [Member] | Valuation Technique, Consensus Pricing Model [Member] |  |
Loans, fair value |  | $ 2,418
Loans, fair value |  | $ 2,418
Commercial Portfolio Segment [Member] | Valuation Technique, Consensus Pricing Model [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input |  | 6.67
Residential Portfolio Segment [Member] | Valuation, Market Approach [Member] |  |
Loans, fair value | $ 760,000 | $ 1,132
Loans, fair value | $ 760,000 | $ 1,132
Residential Portfolio Segment [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | (0.194) | (0.0891)
Residential Portfolio Segment [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | (0.2495) | (0.0622)
Residential Portfolio Segment [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | (0.1022) | (0.0716)
Consumer Portfolio Segment [Member] | Valuation, Market Approach [Member] |  |
Loans, fair value | $ 35,000 |
Loans, fair value | $ 35,000 |
Consumer Portfolio Segment [Member] | Valuation, Market Approach [Member] | Minimum [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | (0.0059) |
Consumer Portfolio Segment [Member] | Valuation, Market Approach [Member] | Maximum [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | 0.0059 |
Consumer Portfolio Segment [Member] | Valuation, Market Approach [Member] | Weighted Average [Member] | Measurement Input, Cap Rate [Member] |  |
Loans, measurement input | 0 |

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