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Note 13 - Fair Value - Quantitative Information for Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - Valuation, Market Approach [Member]
 6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Unobservable Input [1] Appraisal adjustments(2)  
Minimum [Member] | Measurement Input, Discount Rate [Member]    
Discount range, impaired loans 0.07 0.06
Discount range, non-covered OREO 0.1 0.08
Discount range, covered OREO 0.49 0
Maximum [Member] | Measurement Input, Discount Rate [Member]    
Discount range, impaired loans 1 0.79
Discount range, non-covered OREO 1 0.47
Discount range, covered OREO 0.49 0.65
Weighted Average [Member] | Measurement Input, Discount Rate [Member]    
Discount range, impaired loans 0.35 0.34
Discount range, non-covered OREO 0.31 0.32
Discount range, covered OREO 0.49 0.52
[1] Appraisals may be adjusted by management for customized discounting criteria, estimated sales costs, and proprietary qualitative adjustments.