Note 12 - Fair Value - Assets Measured at Fair Value on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Impaired Loans [Member] | Non-covered Loans [Member]
Total Fair Value	$ 6,757	$ 4,078
Impaired Loans [Member] | Non-covered Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value
Impaired Loans [Member] | Non-covered Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value
Impaired Loans [Member] | Non-covered Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	6,757	4,078
OREO [Member] | Non-covered Loans [Member]
Total Fair Value	2,293	5,109
OREO [Member] | Non-covered Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value
OREO [Member] | Non-covered Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value
OREO [Member] | Non-covered Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	2,293	5,109
OREO [Member] | Covered Loans [Member]
Total Fair Value	54	265
OREO [Member] | Covered Loans [Member] | Fair Value, Inputs, Level 1 [Member]
Total Fair Value
OREO [Member] | Covered Loans [Member] | Fair Value, Inputs, Level 2 [Member]
Total Fair Value
OREO [Member] | Covered Loans [Member] | Fair Value, Inputs, Level 3 [Member]
Total Fair Value	$ 54	$ 265