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	Mar. 31, 2019 USD ($)
Impaired loans, fair value	$ 16,762
Foreclosed assets held for sale, fair value
Minimum [Member]
Impaired loans (collateral dependent)	0
Maximum [Member]
Impaired loans (collateral dependent)	52
Weighted Average [Member]
Impaired loans (collateral dependent)	3