Note 8 - Loans and Related Allowance for Credit Losses - Additional Information on Impaired Loans (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)
Average recorded investment	$ 7,888
Interest income recognized	98
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Average recorded investment	724
Interest income recognized	11
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Average recorded investment	5,255
Interest income recognized	58
Residential Portfolio Segment [Member]
Average recorded investment	1,050
Interest income recognized	12
Commercial And Industrial [Member]
Average recorded investment	609
Interest income recognized	14
Home Equity Lines of Credit [Member]
Average recorded investment	250
Interest income recognized	$ 3