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Note 4 - Fair Value Measurements (Details) - Additional Quantitative Information about Assets Measured at Fair Value on Non-recurring Basis - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Estimate (in Dollars) $ 4,486  
Valuation Techniques / Unobservable Input Appraisal of collateral (1)  
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Estimate (in Dollars) $ 10,350 $ 5,981
Valuation Techniques / Unobservable Input Discounted cash flow Appraisal of collateral (1) [1]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Estimate (in Dollars) $ 1,447 $ 1,412
Valuation Techniques / Unobservable Input [1] Appraisal of collateral (1) Appraisal of collateral (1)
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair Value Estimate (in Dollars)   $ 6,867
Valuation Techniques / Unobservable Input   Discounted cash flow
Minimum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 0.00%  
Discount Rate, Weighted Average (0.00%)  
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 3.10% 0.00%
Discount Rate, Weighted Average (3.10%) (0.00%)
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 0.00% 0.00%
Discount Rate, Weighted Average (0.00%) (0.00%)
Minimum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate   3.10%
Discount Rate, Weighted Average   (3.10%)
Maximum [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 66.40%  
Discount Rate, Weighted Average (66.40%)  
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 7.90% 87.10%
Discount Rate, Weighted Average (7.90%) (87.10%)
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 10.00% 10.00%
Discount Rate, Weighted Average (10.00%) (10.00%)
Maximum [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate   7.90%
Discount Rate, Weighted Average   (7.90%)
Weighted Average [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 38.20%  
Discount Rate, Weighted Average (38.20%)  
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 4.90% 23.30%
Discount Rate, Weighted Average (4.90%) (23.30%)
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Appraisal Adjustments [Member] | Other Real Estate Owned [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate 7.20% 7.30%
Discount Rate, Weighted Average (7.20%) (7.30%)
Weighted Average [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Income Approach Valuation Technique [Member] | Impaired Loans [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Discount Rate   5.00%
Discount Rate, Weighted Average   (5.00%)
[1] Fair value is generally determined through independent appraisals of the underlying collateral, which generally include various level 3 inputs which are not identifiable.