Note 8 - Loans and Related Allowance for Loan and Lease Losses - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Loans, current balance	$ 981,921	$ 975,566
Loans, past due	16,079	8,692
Loans	998,000	984,258
Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	10,110	2,589
Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	806	345
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	5,163	5,758
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Loans, current balance	112,222	101,264
Loans, past due	1,050	1,122
Loans	113,272	102,386
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due		64
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	1,050	1,058
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Loans, current balance	282,603	298,941
Loans, past due	10,172	3,239
Loans	292,775	302,180
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	6,885
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	48
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	3,239	3,239
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Loans, current balance	52,276	62,028
Loans, past due
Loans	52,276	62,028
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due
Residential Portfolio Segment [Member]
Loans, current balance	230,471	232,518
Loans, past due	3,429	2,280
Loans	233,900	234,798
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	2,577	1,439
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	462	34
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	390	807
Commercial And Industrial [Member]
Loans, current balance	106,157	88,965
Loans, past due	640	562
Loans	106,797	89,527
Commercial And Industrial [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	329	190
Commercial And Industrial [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	118	66
Commercial And Industrial [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	193	306
Home Equity Lines of Credit [Member]
Loans, current balance	114,611	111,792
Loans, past due	322	456
Loans	114,933	112,248
Home Equity Lines of Credit [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	101	274
Home Equity Lines of Credit [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	156	29
Home Equity Lines of Credit [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	65	153
Construction and Other [Member]
Loans, current balance	71,005	66,680
Loans, past due	181
Loans	71,186	66,680
Construction and Other [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	181
Construction and Other [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due
Construction and Other [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due
Consumer Portfolio Segment [Member]
Loans, current balance	12,576	13,378
Loans, past due	285	1,033
Loans	12,861	14,411
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans, past due	37	622
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans, past due	22	216
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans, past due	$ 226	$ 195