Note 8 - Loans and Related Allowance for Credit Losses - Collateral-dependent Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Outstanding balance	$ 1,382,847	$ 1,352,872
Real Estate [Member]
Outstanding balance	16,151
Blanket Lien [Member]
Outstanding balance	47
Investment and Cash [Member]
Outstanding balance	0
Other Collateral [Member]
Outstanding balance	18
Collateral Pledged [Member]
Outstanding balance	16,216
Commercial Real Estate Portfolio Segment [Member] \| Non-owner occupied Loan [Member]
Outstanding balance	394,331	380,580
Commercial Real Estate Portfolio Segment [Member] \| Non-owner occupied Loan [Member] \| Real Estate [Member]
Outstanding balance	15,854
Commercial Real Estate Portfolio Segment [Member] \| Non-owner occupied Loan [Member] \| Blanket Lien [Member]
Outstanding balance	0
Commercial Real Estate Portfolio Segment [Member] \| Non-owner occupied Loan [Member] \| Investment and Cash [Member]
Outstanding balance	0
Commercial Real Estate Portfolio Segment [Member] \| Non-owner occupied Loan [Member] \| Other Collateral [Member]
Outstanding balance	0
Commercial Real Estate Portfolio Segment [Member] \| Non-owner occupied Loan [Member] \| Collateral Pledged [Member]
Outstanding balance	15,854
Residential Portfolio Segment [Member]
Outstanding balance	306,179	296,308
Residential Portfolio Segment [Member] \| Real Estate [Member]
Outstanding balance	177
Residential Portfolio Segment [Member] \| Blanket Lien [Member]
Outstanding balance	0
Residential Portfolio Segment [Member] \| Investment and Cash [Member]
Outstanding balance	0
Residential Portfolio Segment [Member] \| Other Collateral [Member]
Outstanding balance	0
Residential Portfolio Segment [Member] \| Collateral Pledged [Member]
Outstanding balance	177
Commercial And Industrial [Member]
Outstanding balance	195,024	195,602
Commercial And Industrial [Member] \| Real Estate [Member]
Outstanding balance	0
Commercial And Industrial [Member] \| Blanket Lien [Member]
Outstanding balance	47
Commercial And Industrial [Member] \| Investment and Cash [Member]
Outstanding balance	0
Commercial And Industrial [Member] \| Other Collateral [Member]
Outstanding balance	18
Commercial And Industrial [Member] \| Collateral Pledged [Member]
Outstanding balance	65
Home Equity Lines of Credit [Member]
Outstanding balance	126,555	$ 128,065
Home Equity Lines of Credit [Member] \| Real Estate [Member]
Outstanding balance	120
Home Equity Lines of Credit [Member] \| Blanket Lien [Member]
Outstanding balance	0
Home Equity Lines of Credit [Member] \| Investment and Cash [Member]
Outstanding balance	0
Home Equity Lines of Credit [Member] \| Other Collateral [Member]
Outstanding balance	0
Home Equity Lines of Credit [Member] \| Collateral Pledged [Member]
Outstanding balance	$ 120