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Note 9 - Fair Value and Interest Rate Risk - Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Measurements, Nonrecurring [Member]
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Other real estate owned, fair value $ 851
Fair Value, Inputs, Level 3 [Member]  
Other real estate owned, fair value 851
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member]  
Other real estate owned, fair value $ 851 [1],[2]
Fair Value, Inputs, Level 3 [Member] | Fair Value of Collateral Approach [Member] | Weighted Average [Member]  
Weighting of qualitative factors(3) 22.60% [3]
[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.