Note 13 - 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	Sep. 30, 2019 USD ($)
Impaired loans, fair value	$ 1,005
Foreclosed assets held for sale, fair value	$ 72
Minimum [Member]
Impaired loans (collateral dependent)	0
Foreclosed assets held for sale	0.58
Maximum [Member]
Impaired loans (collateral dependent)	0.59
Foreclosed assets held for sale	0.66
Weighted Average [Member]
Impaired loans (collateral dependent)	(0.23)
Foreclosed assets held for sale	(0.62)