Note 14 - Disclosures About Fair Value of Assets and Liabilities - Fair Value Quantitative Information (Details) - Fair Value, Inputs, Level 3 [Member] - Valuation, Market Approach [Member] $ in Thousands	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Impaired loans, fair value	$ 10,428	$ 2,224
Foreclosed assets held for sale, fair value	$ 909
Foreclosed assets held for sale		0
Minimum [Member]
Impaired loans (collateral dependent)	0	0
Foreclosed assets held for sale	25
Maximum [Member]
Impaired loans (collateral dependent)	100	100
Foreclosed assets held for sale	34
Weighted Average [Member]
Impaired loans (collateral dependent)	8	12
Foreclosed assets held for sale	30