Note 17 - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3) (Details) - Fair Value, Inputs, Level 3 [Member] $ in Thousands	Sep. 30, 2018 USD ($)
Impaired loans	$ 3,080
OREO	1,489
Assets held-for-sale	$ 198
Minimum [Member] | Measurement Input, Comparability Adjustment [Member]
Impaired loans, appraisal comparability adjustment	0.09
OREO, appraisal comparability adjustment	0.09
Assets held-for-sale	0.09
Maximum [Member] | Measurement Input, Comparability Adjustment [Member]
Impaired loans, appraisal comparability adjustment	0.1
OREO, appraisal comparability adjustment	0.1
Assets held-for-sale	0.1
Weighted Average [Member] | Measurement Input, Comparability Adjustment [Member]
Impaired loans, appraisal comparability adjustment	0.095
OREO, appraisal comparability adjustment	0.095
Assets held-for-sale	0.095