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Note 12 - Fair Value and Interest Rate Risk (Details) - Quantitative Information About Level 3 Fair Value Measurements - 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 (in Dollars) $ 16,581 $ 12,851
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value of Collateral Approach [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Fair value (in Dollars) [1],[2],[3] $ 2,240 $ 363
Range [1],[2],[3] 8.00%
Weighted average [1],[2],[3] (8.00%)
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value of Collateral Approach [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range [1],[2],[3] 14.00%  
Weighted average [1],[2],[3] (14.00%)  
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value of Collateral Approach [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range [1],[2],[3] 23.00%  
Weighted average [1],[2],[3] (23.00%)  
Fair Value, Inputs, Level 3 [Member] | Weighted Average [Member] | Fair Value, Measurements, Nonrecurring [Member] | Fair Value of Collateral Approach [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Range [1],[2],[3] 16.00% 8.00%
Weighted average [1],[2],[3] (16.00%) (8.00%)
[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, 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.