Note 3 - Loans - Summary of Nonaccrual Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Nonaccrual, No Allowance	$ 1,572
Nonaccrual, With Allowance	315
Nonaccrual loans	1,887	$ 1,307
Residential Real Estate [Member]
Nonaccrual loans	552
Business Assets [Member]
Nonaccrual loans	0
Land [Member]
Nonaccrual loans	0
Commercial Real Estate [Member]
Nonaccrual loans	403
Owner Occupied [Member]
Nonaccrual loans	617
Collateral Pledged [Member]
Nonaccrual loans	1,572
Commercial Portfolio Segment [Member]
Nonaccrual, No Allowance	0
Nonaccrual, With Allowance	4
Nonaccrual loans	4	4
Commercial Portfolio Segment [Member] | Residential Real Estate [Member]
Nonaccrual loans	0
Commercial Portfolio Segment [Member] | Business Assets [Member]
Nonaccrual loans	0
Commercial Portfolio Segment [Member] | Land [Member]
Nonaccrual loans	0
Commercial Portfolio Segment [Member] | Commercial Real Estate [Member]
Nonaccrual loans	295
Commercial Portfolio Segment [Member] | Owner Occupied [Member]
Nonaccrual loans	617
Commercial Portfolio Segment [Member] | Collateral Pledged [Member]
Nonaccrual loans	912
Residential Portfolio Segment [Member] | Residential [Member]
Nonaccrual, No Allowance	499
Nonaccrual, With Allowance	250
Nonaccrual loans	749	797
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Nonaccrual, No Allowance	161
Nonaccrual, With Allowance	42
Nonaccrual loans	203	205
Residential Portfolio Segment [Member] | Residential Real Estate [Member] | Residential [Member]
Nonaccrual loans	391
Residential Portfolio Segment [Member] | Residential Real Estate [Member] | Home Equity Line of Credit [Member]
Nonaccrual loans	161
Residential Portfolio Segment [Member] | Business Assets [Member] | Residential [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Business Assets [Member] | Home Equity Line of Credit [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Land [Member] | Residential [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Land [Member] | Home Equity Line of Credit [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Commercial Real Estate [Member] | Residential [Member]
Nonaccrual loans	108
Residential Portfolio Segment [Member] | Commercial Real Estate [Member] | Home Equity Line of Credit [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Owner Occupied [Member] | Residential [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Owner Occupied [Member] | Home Equity Line of Credit [Member]
Nonaccrual loans	0
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Residential [Member]
Nonaccrual loans	499
Residential Portfolio Segment [Member] | Collateral Pledged [Member] | Home Equity Line of Credit [Member]
Nonaccrual loans	161
Commercial Real Estate Portfolio Segment [Member] | Construction and Land Development [Member]
Nonaccrual, No Allowance	0
Nonaccrual, With Allowance	0
Nonaccrual loans	0	0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]
Nonaccrual, No Allowance	617
Nonaccrual, With Allowance	0
Nonaccrual loans	617	0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Nonaccrual, No Allowance	295
Nonaccrual, With Allowance	0
Nonaccrual loans	295	301
Consumer Portfolio Segment [Member]
Nonaccrual, No Allowance	0
Nonaccrual, With Allowance	19
Nonaccrual loans	$ 19	$ 0