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Note 6 - Fair Value Measurements and Fair Value of Financial Instruments - Significant Unobservable Inputs for Assets Measured on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
--- | --- | ---
Commercial Portfolio Segment [Member] |  |
Collateral dependent loans, fair value | $ 763 | $ 657
Collateral dependent loans, fair value | 763 | 657
Commercial Real Estate Portfolio Segment [Member] |  |
Collateral dependent loans, fair value |  | 7,005
Collateral dependent loans, fair value |  | 7,005
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] |  |
Collateral dependent loans, fair value | 763 | 657
Collateral dependent loans, fair value | $ 763 | 657
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Valuation, Market Approach [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] |  |
Collateral dependent loans, fair value |  | 657
Collateral dependent loans, fair value |  | $ 657
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Valuation, Market Approach [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Minimum [Member] |  |
Collateral dependent loans, rate |  | 0.001
Collateral dependent loans, rate |  | 0.001
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Valuation, Market Approach [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Maximum [Member] |  |
Collateral dependent loans, rate |  | (0.075)
Collateral dependent loans, rate |  | (0.075)
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Valuation, Market Approach [Member] | Average Transfer Price as Price to Unpaid Principal Balance [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate |  | 0.25
Collateral dependent loans, rate |  | 0.25
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member] |  |
Collateral dependent loans, rate | (0.075) |
Collateral dependent loans, rate | (0.075) |
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member] |  |
Collateral dependent loans, rate | 0.25 |
Collateral dependent loans, rate | 0.25 |
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate | 0.008 |
Collateral dependent loans, rate | 0.008 |
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Collateral dependent loans, fair value |  | $ 7,005
Collateral dependent loans, fair value |  | 7,005
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] |  |
Collateral dependent loans, fair value |  | 7,005
Collateral dependent loans, fair value |  | $ 7,005
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member] |  |
Collateral dependent loans, rate |  | 0.103
Collateral dependent loans, rate |  | 0.103
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member] |  |
Collateral dependent loans, rate |  | (0.15)
Collateral dependent loans, rate |  | (0.15)
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Appraisals of Collateral Value [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member] |  |
Collateral dependent loans, rate |  | 0
Collateral dependent loans, rate |  | 0

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