Note 2 - Loans and Allowance for Credit Losses - Impaired Loans, Average Investment and Interest Income (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($)
Average recorded investment	$ 3,067	[1]
Interest income recognized	13
Investor Owned Residential Real Estate [Member] | Consumer Real Estate Portfolio Segment [Member]
Average recorded investment	189	[1]
Interest income recognized	9
Commercial Real Estate, Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Average recorded investment	2,601	[1]
Interest income recognized	4
Commercial and Industrial [Member] | Commercial Non Real Estate Segment [Member]
Average recorded investment	277	[1]
Interest income recognized	$ 0

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