Note 8 - Fair Value Disclosure - Significant Unobservable Inputs Used in the Fair Value Measurements (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Nonrecurring [Member] - Valuation, Market Approach [Member] - Measurement Input, Discount for Lack of Marketability [Member] $ in Thousands		Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Impaired Loans		$ 2,604	$ 3,140
OREO		$ 76	$ 58
Minimum [Member]
Impaired Loans, measurement input	[1]	0.1
OREO, measurement input	[1]	0.1
Maximum [Member]
Impaired Loans, measurement input	[1]	0.3
OREO, measurement input	[1]	0.5

[1] Range includes discounts taken since appraisal and estimated values.