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Note 15 - Fair Value Measurements - Level 3 Fair Value Measurements (Details) - Valuation, Market Approach [Member]
Dec. 31, 2020
Dec. 31, 2019
Measurement Input, Discount Rate [Member] | Minimum [Member]    
Discount rate [1] 0.0550 0.0550
Measurement Input, Discount Rate [Member] | Maximum [Member]    
Discount rate [1] 0.0650 0.0650
Measurement Input, Discount Rate [Member] | Weighted Average [Member]    
Discount rate [1] (0.0578) (0.0577)
Measurement Input, Cost to Sell [Member] | Maximum [Member]    
Level 3 Fair Value Measurements [2] 0.0923 0.0600
Measurement Input, Cost to Sell [Member] | Weighted Average [Member]    
Level 3 Fair Value Measurements [2] (0.0454) (0.0068)
Measurement Input, Discount for Lack of Marketability and Age of Appraisal [Member] | Minimum [Member]    
Level 3 Fair Value Measurements [2] 0.0000 0.0000
Measurement Input, Discount for Lack of Marketability and Age of Appraisal [Member] | Maximum [Member]    
Level 3 Fair Value Measurements [2] 0.0766 0.4517
Measurement Input, Discount for Lack of Marketability and Age of Appraisal [Member] | Weighted Average [Member]    
Level 3 Fair Value Measurements [2] (0.0062) (0.0128)
[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