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Note 11 - Fair Value of Financial Instruments - Quantitative Information About Non-recurring Level 3 Fair Value of Financial Instruments and the Fair Value Measurements (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Other real estate owned $ 239 $ 239 $ 0 $ 0 $ 0 $ 0
Fair Value, Nonrecurring [Member]            
Impaired loans 778   4,111      
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member]            
Impaired loans     2,724      
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member]            
Impaired loans $ 149          
Impaired loans, Measurement Input 0.150          
Other repossessed assets     $ 35      
Other repossessed assets, Measurement Input     0.000      
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Minimum [Member]            
Impaired loans, Measurement Input     (0.365)      
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Maximum [Member]            
Impaired loans, Measurement Input     0.150      
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Loss Severity [Member] | Weighted Average [Member]            
Impaired loans, Measurement Input     0.104      
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member]            
Impaired loans, Measurement Input     0.000      
Other real estate owned $ 239          
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member]            
Other real estate owned, Measurement Input 0.005          
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member]            
Other real estate owned, Measurement Input 0.125          
Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member]            
Other real estate owned, Measurement Input 0.065          
Fair Value, Nonrecurring [Member] | Valuation, Income Approach [Member] | Measurement Input, Loss Severity [Member]            
Impaired loans, Measurement Input     0.150      
Fair Value, Nonrecurring [Member] | Valuation, Income Approach [Member] | Measurement Input, Cap Rate [Member]            
Impaired loans     $ 204      
Impaired loans, Measurement Input     0.085      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member]            
Impaired loans     $ 1,183      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Loss Severity [Member]            
Impaired loans, Measurement Input 0.150   0.150      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Cap Rate [Member] | Minimum [Member]            
Impaired loans, Measurement Input 0.090   0.074      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Cap Rate [Member] | Maximum [Member]            
Impaired loans, Measurement Input 0.095   0.098      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Cap Rate [Member] | Weighted Average [Member]            
Impaired loans, Measurement Input 0.092   0.087      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member]            
Impaired loans $ 629          
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Minimum [Member]            
Impaired loans, Measurement Input (0.150)   (0.300)      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Maximum [Member]            
Impaired loans, Measurement Input 0.150   0.100      
Fair Value, Nonrecurring [Member] | Blended Income and Sales Approach [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member]            
Impaired loans, Measurement Input (0.037)   (0.078)