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Note 9 - Fair Value Disclosure - Significant Unobservable Inputs Used in the Fair Value Measurements (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Impaired Loans $ 9,156 $ 9,701
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member]    
Impaired Loans $ 2,271 2,497
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]    
Significant Unobservable Input Value 10.00%  
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]    
Significant Unobservable Input Value [1] 30.00%  
Fair Value, Inputs, Level 3 [Member] | OREO [Member] | Market Approach Valuation Technique [Member]    
OREO $ 169
Fair Value, Inputs, Level 3 [Member] | OREO [Member] | Market Approach Valuation Technique [Member] | Minimum [Member]    
Significant Unobservable Input Value 10.00%  
Fair Value, Inputs, Level 3 [Member] | OREO [Member] | Market Approach Valuation Technique [Member] | Maximum [Member]    
Significant Unobservable Input Value [1] 50.00%  
[1] Range includes discounts taken since appraisal and estimated values.