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Note 12 - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
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%  
Fair Value, Inputs, Level 3 [Member] | Fair Value of Property Approach [Member]    
Other real estate owned, fair value [1],[2] $ 851  
Quantitative Information about Level 3 Fair Value Measurements Range [1],[2] 9.60%  
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]   8.00%
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, fair value [1],[2]   $ 363
Fair Value, Inputs, Level 3 [Member]    
Other real estate owned, fair value $ 851  
Impaired loans, fair value 363
Other real estate owned, fair value 851  
Impaired loans, fair value $ 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.
[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.