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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] | Minimum [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 Range [1],[2] 13.00%  
Fair Value, Inputs, Level 3 [Member] | Minimum [Member] | Fair Value of Collateral Approach [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2]   8.00%
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Fair Value of Property Approach [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] (3.00%)  
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] (3.00%)  
Fair Value, Inputs, Level 3 [Member] | Maximum [Member] | Fair Value of Collateral Approach [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2]   (3.00%)
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%)  
Other real estate owned [1],[2] $ 851  
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] (13.00%)  
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member]    
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2]   (8.00%)
Impaired loans [1],[2]   $ 363
Fair Value, Inputs, Level 3 [Member]    
Other real estate owned $ 851
Impaired loans 363
Other real estate owned 851
Impaired loans $ 363
[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.