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Note 5 - Fair Value Measurements - Additional Quantitative Information About Assets Measured at Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - Fair Value, Inputs, Level 3 [Member] - Appraisal of Collateral [Member]
$ in Thousands
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Impaired loans, fair value estimate [1] $ 4,269 $ 4,162
Minimum [Member] | Measurement Input, Appraised Value [Member]    
Impaired loans [2] 0.250 0.250
Maximum [Member] | Measurement Input, Appraised Value [Member]    
Impaired loans [2] 0.722 0.722
Weighted Average [Member] | Measurement Input, Appraised Value [Member]    
Impaired loans [2] (0.366) (0.366)
[1] Fair value is generally determined through independent appraisals of the underlying collateral, which typically include various level III inputs that are not identifiable, less any associated allowance.
[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.