Note 5 - Loans - Non-accrual Troubled Debt Restructurings (Details) - Non-accruing Troubled Debt Restructuring [Member] - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Accruing TDRs	$ 6,348	$ 8,175
Payment Deferral [Member]
Accruing TDRs	6,348	8,175
Contractual Interest Rate Reduction [Member]
Accruing TDRs	0	0
Rate Reduction and Payment Deferral [Member]
Accruing TDRs	0	0
Commercial Portfolio Segment [Member]
Accruing TDRs	3,629	7,717
Commercial Portfolio Segment [Member] | Payment Deferral [Member]
Accruing TDRs	3,629	7,717
Commercial Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Accruing TDRs	0	0
Commercial Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Accruing TDRs	0	0
Commercial Real Estate Portfolio Segment [Member]
Accruing TDRs	1,098
Commercial Real Estate Portfolio Segment [Member] | Payment Deferral [Member]
Accruing TDRs	1,098
Commercial Real Estate Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Accruing TDRs	0
Commercial Real Estate Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Accruing TDRs	0
Residential Portfolio Segment [Member]
Accruing TDRs	1,621	458
Residential Portfolio Segment [Member] | Payment Deferral [Member]
Accruing TDRs	1,621	458
Residential Portfolio Segment [Member] | Contractual Interest Rate Reduction [Member]
Accruing TDRs	0	0
Residential Portfolio Segment [Member] | Rate Reduction and Payment Deferral [Member]
Accruing TDRs	$ 0	$ 0