Note 5 - Allowance for Loan Losses, Nonperforming Assets and Impaired Loans - Impaired Loans and Associated Reserves (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Principal balance		$ 6,478	$ 5,453
Total recorded investment	[1]	5,878	4,903
Recorded investment for which there is a related allowance	[1]	0	1,045
Related allowance		(0)	75
Recorded investment for which there is no related allowance	[1]	5,878	3,858
Consumer Real Estate Portfolio Segment [Member] | Investor Owned Residential Real Estate [Member]
Principal balance	[2]	191	194
Total recorded investment	[1],[2]	191	194
Recorded investment for which there is a related allowance	[1],[2]	0	194
Related allowance	[2]	0	2
Recorded investment for which there is no related allowance	[1],[2]		0
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate, Owner Occupied [Member]
Principal balance	[2]	3,256	3,752
Total recorded investment	[1],[2]	2,665	3,202
Recorded investment for which there is no related allowance	[1],[2]	2,665	3,202
Commercial Real Estate Portfolio Segment [Member] | Commercial Real Estate Other [Member]
Principal balance	[2]	2,721	654
Total recorded investment	[1],[2]	2,721	654
Recorded investment for which there is no related allowance	[1],[2]	2,721	654
Commercial Non Real Estate Segment [Member] | Commercial and Industrial [Member]
Principal balance	[2]	310	851
Total recorded investment	[1],[2]	301	851
Recorded investment for which there is a related allowance	[1],[2]	0	851
Related allowance	[2]	$ 0	73
Consumer Non Real Estate Portfolio Segment [Member] | Automobile Loan [Member]
Principal balance	[2]		2
Total recorded investment	[1],[2]		2
Recorded investment for which there is no related allowance	[1],[2]		$ 2

[1] Recorded investment is net of charge-offs and interest paid while a loan is in nonaccrual status.

[2] Only classes with impaired loans are shown.