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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) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]    
Range, capitalization rate 6.00% 7.30%
Range, loss severity discount 8.70%  
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]    
Range, capitalization rate 7.10% 8.50%
Range, loss severity discount 15.00%  
Impaired Loans [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]    
Range, capitalization rate 7.10% 7.70%
Range, loss severity discount 14.00% 15.00%
Impaired Loans [Member] | Income Approach Valuation Technique [Member]    
Assets $ 2,472 $ 3,878
Range, loss severity discount   15.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]    
Range, comparability adjustments (40.00%) (50.00%)
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]    
Range, comparability adjustments 16.20% 40.00%
Impaired Loans [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]    
Range, loss severity discount 15.00% 15.00%
Range, comparability adjustments (3.10%) (2.20%)
Impaired Loans [Member] | Sales Approach Valuation Technique [Member]    
Assets $ 4,426 $ 5,555
Range, loss severity discount 15.00% 15.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]    
Range, capitalization rate 5.30% 5.30%
Range, loss severity discount 6.90% 5.20%
Range, comparability adjustments (50.00%) (50.00%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]    
Range, capitalization rate 11.00% 9.00%
Range, loss severity discount 15.00% 15.00%
Range, comparability adjustments 25.00% 25.00%
Impaired Loans [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]    
Range, capitalization rate 7.10% 7.00%
Range, loss severity discount 13.80% 13.70%
Range, comparability adjustments (2.40%) (2.20%)
Impaired Loans [Member] | Blended Income and Sales Approach [Member]    
Assets $ 5,246 $ 5,927
Impaired Loans [Member]    
Assets $ 12,144 $ 15,360
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Minimum [Member]    
Range, comparability adjustments (5.00%)  
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Maximum [Member]    
Range, comparability adjustments 25.00%  
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member] | Weighted Average [Member]    
Range, capitalization rate   9.00%
Range, comparability adjustments 2.80%  
Other Real Estate Owned [Member] | Income Approach Valuation Technique [Member]    
Assets $ 2,839 $ 3,750
Range, capitalization rate   9.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Minimum [Member]    
Range, comparability adjustments   (5.00%)
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Maximum [Member]    
Range, comparability adjustments   25.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member] | Weighted Average [Member]    
Range, comparability adjustments   12.00%
Other Real Estate Owned [Member] | Sales Approach Valuation Technique [Member]    
Assets   $ 366
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Minimum [Member]    
Range, comparability adjustments   (10.00%)
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Maximum [Member]    
Range, comparability adjustments   15.00%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member] | Weighted Average [Member]    
Range, capitalization rate   8.60%
Range, comparability adjustments   2.50%
Other Real Estate Owned [Member] | Blended Income and Sales Approach [Member]    
Assets   $ 816
Range, capitalization rate   8.60%
Other Real Estate Owned [Member]    
Assets 2,839 $ 4,932
Assets $ 14,983 $ 20,292