Note 4 - Loans and Leases - Average Balance and Interest Income by Loan Category Recognized on Impaired Loans (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021
Average balance		$ 8,736	$ 11,020
Interest income	[1]	335	305
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Average balance		1,640	1,966
Interest income	[1]	65	71
Commercial Real Estate Portfolio Segment [Member] | Real Estate Loan [Member]
Average balance		6,614	8,052
Interest income	[1]	251	223
Construction, Land Acquisition and Development [Member] | Real Estate Loan [Member]
Average balance		0	33
Interest income	[1]	0	2
Commercial and Industrial [Member]
Average balance		482	969
Interest income	[1]	19	9
Consumer Portfolio Segment [Member]
Average balance		0	0
Interest income	[1]	0	0
State and Political Subdivisions [Member]
Average balance		0	0
Interest income	[1]	$ 0	$ 0

[1] Interest income represents income recognized on performing TDRs.