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Note 10 - Fair Value of Financial Instruments - Quantitative Information About Non-recurring Level 3 Fair Value of Financial Instruments and the Fair Value Measurements (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Fair Value $ 14,418 $ 15,501
Fair Value 14,418 15,501
Impaired Loans [Member]    
Fair Value 14,418 14,968
Fair Value 14,418 14,968
Impaired Loans [Member] | Income Approach Valuation Technique [Member]    
Fair Value $ 1,773 $ 2,007
Range, loss severity discount 15.00% 15.00%
Fair Value $ 1,773 $ 2,007
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]    
Range, capitalization rate 6.00% 6.00%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]    
Range, capitalization rate 7.50% 7.50%
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]    
Range, capitalization rate 6.80% 7.00%
Range, loss severity discount 15.00% 15.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member]    
Fair Value $ 7,674 $ 8,703
Fair Value $ 7,674 $ 8,703
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]    
Range, loss severity discount 0.00% 0.00%
Range, comparability adjustments (40.00%) (40.00%)
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]    
Range, loss severity discount 15.00% 15.00%
Range, comparability adjustments 16.20% 16.20%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]    
Range, loss severity discount 7.70% 7.70%
Range, comparability adjustments 2.00% 1.50%
Impaired Loans [Member] | Blended Income and Sales Approach [Member]    
Fair Value $ 4,971 $ 4,258
Range, loss severity discount   15.00%
Fair Value $ 4,971 $ 4,258
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]    
Range, capitalization rate 5.00% 5.30%
Range, loss severity discount 14.50%  
Range, comparability adjustments (30.00%) (50.00%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]    
Range, capitalization rate 9.80% 9.50%
Range, loss severity discount 15.00%  
Range, comparability adjustments 25.00% 25.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]    
Range, capitalization rate 7.40% 7.20%
Range, loss severity discount 15.00% 15.00%
Range, comparability adjustments 1.60% 0.60%
Other Real Estate Owned [Member]    
Fair Value $ 533
Fair Value 533
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member]    
Fair Value   533
Fair Value   $ 533
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]    
Range, comparability adjustments   3.30%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]    
Range, comparability adjustments   18.60%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]    
Range, comparability adjustments   11.00%