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Note 15 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Nonrecurring [Member] - Measurement Input, Discount Rate [Member] - Valuation, Market Approach [Member]
Mar. 31, 2020
Dec. 31, 2019
Minimum [Member]    
Discount range, impaired loans [1],[2] 0.21 0.22
OREO [1],[2] 0 0.15
Maximum [Member]    
Discount range, impaired loans [1],[2] 0.69 0.36
OREO [1],[2] 0.77 1
Weighted Average [Member]    
Discount range, impaired loans [1],[2] (0.44) (0.26)
OREO [1],[2] (0.23) (0.08)
[1] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.
[2] Fair value is generally based on appraisals of the underlying collateral.