Note 7 - Fair Value - Schedule of Quantitative Information About Level 3 Fair Value Measurements (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Commercial Real Estate Portfolio Segment [Member]
Impaired loans	$ 325	$ 470
Commercial Portfolio Segment [Member]
Impaired loans		54
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member]
Impaired loans	$ 325	$ 470
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Weighted Average [Member]
Impaired loans, measurement input		0.10
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Measurement Input, Comparability Adjustment [Member] | Weighted Average [Member]
Impaired loans, measurement input	0.10
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member]
Impaired loans		$ 54
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Weighted Average [Member]
Impaired loans, measurement input		0.10