Note 8 - Loans and Related Allowance for Loan and Lease Losses - Nonaccrual Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Loans, current balance	$ 6,806	$ 7,858
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Loans, current balance	367	458
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Loans, current balance	3,258	3,758
Loans, past due	0	0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Loans, current balance	0
Loans, past due	0
Residential Portfolio Segment [Member]
Loans, current balance	2,464	2,487
Loans, past due	0	0
Commercial And Industrial [Member]
Loans, current balance	295	509
Loans, past due	0	0
Home Equity Lines of Credit [Member]
Loans, current balance	221	422
Loans, past due	0	0
Consumer Portfolio Segment [Member]
Loans, current balance	201	224
Loans, past due	0	$ 0
Construction and Other [Member]
Loans, current balance	0
Loans, past due	$ 0