Note 5 - Fair Value Measurements - Additional Quantitative Information About Assets Measured at Fair Value on Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands		Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Other real estate owned		$ 6,792
Fair Value, Inputs, Level 3 [Member]
Other real estate owned		6,792
Fair Value, Inputs, Level 3 [Member] | Appraisal of Collateral [Member]
Other real estate owned		$ 6,792
Impaired loans, fair value estimate	[1]		$ 4,162
Fair Value, Inputs, Level 3 [Member] | Appraisal of Collateral [Member] | Minimum [Member] | Measurement Input, Appraised Value [Member]
Other real estate owned		14.2
Impaired loans	[2]		25.0
Fair Value, Inputs, Level 3 [Member] | Appraisal of Collateral [Member] | Maximum [Member] | Measurement Input, Appraised Value [Member]
Impaired loans	[2]		72.2
Fair Value, Inputs, Level 3 [Member] | Appraisal of Collateral [Member] | Weighted Average [Member] | Measurement Input, Appraised Value [Member]
Impaired loans	[2]		(36.6)

[1] Fair value is generally determined through independent appraisals of the underlying collateral, which typically include various level III inputs that are not identifiable, less any associated allowance.

[2] Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range and weighted average of liquidation expenses and other appraisal adjustments are presented as a percent of the appraisal.