Note 6 - Allowance for Credit Losses and Credit Quality Information - Summary of Collateral Dependent Loans (Details) $ in Thousands	Dec. 31, 2023 USD ($)
Related allowance	$ 428
Recorded investment	4,284
Unpaid principal balance	4,618
Residential Portfolio Segment [Member]
Recorded investment, with no related allowance	758
Unpaid principal balance, with no related allowance	758
Recorded investment, with related allowance	221
Unpaid principal balance, with related allowance	221
Related allowance	28
Recorded investment	979
Unpaid principal balance	979
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Recorded investment, with no related allowance	668
Unpaid principal balance, with no related allowance	668
Related allowance	0	[1]
Recorded investment	668	[1]
Unpaid principal balance	668	[1]
Consumer Portfolio Segment [Member]
Recorded investment, with no related allowance	306
Unpaid principal balance, with no related allowance	306
Recorded investment, with related allowance	119
Unpaid principal balance, with related allowance	119
Related allowance	103	[2]
Recorded investment	425	[2]
Unpaid principal balance	425	[2]
Commercial Portfolio Segment [Member]
Recorded investment, with related allowance	2,212
Unpaid principal balance, with related allowance	2,546
Related allowance	297	[3]
Recorded investment	2,212	[3]
Unpaid principal balance	$ 2,546	[3]

[1] Secured by commercial land.

[2] Secured by second mortgages on single family housing and recreational vehicles.

[3] Secured by business equipment primarily related to the farming and trucking industries.