Note 2 - Loans and Allowance for Credit Losses - Impaired Loans, Average Investment and Interest Income (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Average recorded investment	$ 5,842	[1]
Interest income recognized	21
Investor Owned Residential Real Estate [Member] | Consumer Real Estate Portfolio Segment [Member]
Average recorded investment	190	[1]
Interest income recognized	3
Commercial Real Estate, Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Average recorded investment	2,640	[1]
Interest income recognized	1
Commercial Real Estate Other [Member] | Commercial Real Estate Portfolio Segment [Member]
Average recorded investment	2,720
Interest income recognized	17
Commercial and Industrial [Member] | Commercial Non Real Estate Segment [Member]
Average recorded investment	292	[1]
Interest income recognized	$ 0

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