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Note 6 - Fair Value Measurements - Level 3 Fair Value Measurements (Details) - Valuation, Market Approach [Member]
Mar. 31, 2021
Dec. 31, 2020
Measurement Input, Discount Rate [Member] | Minimum [Member]    
Impaired loans [1] 0.0600 0.0550
OREO [2]   0.0000
Measurement Input, Discount Rate [Member] | Maximum [Member]    
Impaired loans [1] 0.0650 0.0650
OREO [2]   0.0766
Measurement Input, Discount Rate [Member] | Weighted Average [Member]    
Impaired loans [1] (0.0626) (0.0578)
Measurement Input, Cost to Sell [Member]    
OREO [3] 0.0620  
Measurement Input, Cost to Sell [Member] | Maximum [Member]    
OREO [2]   0.0923
Measurement Input, Cost to Sell [Member] | Weighted Average [Member]    
OREO [2]   (0.0454)
[1] Unobservable inputs were weighted by the relative fair value of the impaired loans.
[2] Discounts were weighted by the relative appraised value of the OREO properties.
[3] As of March 31, 2021 OREO was composed of a single property.