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Note 10 - Fair Value Measurements - Assets Measured At Fair Value on a Non-recurring Basis and Quantitative Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Recorded Investment $ 13,472 $ 12,417
Related Allowance 906 657
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Impaired Loans, Collateral Dependent [Member]    
Recorded Investment 8,635 8,020
Related Allowance 605 606
Fair Value $ 8,030 $ 7,414
Selling Cost 10.00%  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Impaired Loans, Collateral Dependent [Member] | Minimum [Member]    
Selling Cost   10.00%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Other Real Estate Owned [Member]    
Recorded Investment $ 919
Related Allowance
Fair Value $ 919
Selling Cost 10.00%  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Market Approach [Member] | Other Real Estate Owned [Member] | Minimum [Member]    
Selling Cost   10.00%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Income Approach [Member] | Impaired Loans, Other [Member]    
Recorded Investment $ 4,838 $ 4,397
Related Allowance 301 51
Fair Value $ 4,537 $ 4,346
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Income Approach [Member] | Impaired Loans, Other [Member] | Minimum [Member]    
Discount Rate 4.00% 3.70%
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Valuation, Income Approach [Member] | Impaired Loans, Other [Member] | Maximum [Member]    
Discount Rate 7.50% 7.50%