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Note 12 - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Minimum [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] 14.00%  
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2] (14.00%)  
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Maximum [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] 23.00%  
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2] (23.00%)  
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Weighted Average [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2],[3] 16.00% 8.00%
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2],[3] (16.00%) (8.00%)
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member]    
Impaired loans [1],[2] $ 1,959 $ 363
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] 8.00%
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2] (8.00%)
Fair Value, Inputs, Level 3 [Member] | Fair Value of Property Approach [Member] | Weighted Average [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2],[3] 9.60%  
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2],[3] (9.60%)  
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2],[3] 13.00%  
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2],[3] (13.00%)  
Fair Value, Inputs, Level 3 [Member] | Fair Value of Property Approach [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] 9.60%  
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2] (9.60%)  
Other real estate owned [1],[2] $ 851  
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] 13.00%  
Quantitative Information about Level 3 Fair Value Measurements Weighted Average Range [1],[2] (13.00%)  
Fair Value, Inputs, Level 3 [Member]    
Impaired loans $ 1,959 $ 363
Other real estate owned 851
Impaired loans 1,959 363
Other real estate owned $ 851
[1] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses.
[2] Fair value is generally determined through independent appraisals of the underlying collateral (in the case of impaired loans) or property (in the case of OREO), which include Level 3 inputs that are not identifiable.
[3] The range and weighted average of qualitative factors such as economic conditions and estimated liquidation expenses are presented as a percent of the appraised value.