Note 8 - ACL on LHFI - Net Charge-offs (Recoveries) by Portfolio (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023
2023 charge-off							$ 10
2022 charge-off							28
2021 charge-off							2
2020 charge-off							4
2019 charge-off							5
Prior, charge-off							83
Revolving loans							86
Chargeoffs	$ 66	$ 119	$ 33	$ 22	$ 21	$ 82	218
Commercial Real Estate Portfolio Segment [Member]
2023 charge-off							0
2022 charge-off							0
2021 charge-off							0
2020 charge-off							0
2019 charge-off							5
Prior, charge-off							16
Revolving loans							0
Chargeoffs	2	18	1	6	1	0	21
Real Estate Loan [Member]
2023 charge-off							0
2022 charge-off							0
2021 charge-off							0
2020 charge-off							0
2019 charge-off							5
Prior, charge-off							16
Revolving loans							0
Chargeoffs							21
Business Loans [Member]
2023 charge-off							5
2022 charge-off							0
2021 charge-off							0
2020 charge-off							0
2019 charge-off							0
Prior, charge-off							67
Revolving loans							0
Chargeoffs							72
Business Loans [Member] | Commercial and Industrial Loans [Member]
2023 charge-off							5
2022 charge-off							0
2021 charge-off							0
2020 charge-off							0
2019 charge-off							0
Prior, charge-off							67
Revolving loans							0
Chargeoffs							72
Consumer Portfolio Segment [Member]
Chargeoffs	$ 59	$ 34	$ 32	$ 11	$ 20	$ 26
Consumer Portfolio Segment [Member] | Other Consumer Loans [Member]
2023 charge-off							5
2022 charge-off							28
2021 charge-off							2
2020 charge-off							4
2019 charge-off							0
Prior, charge-off							0
Revolving loans							0
Chargeoffs							39
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
2023 charge-off							0
2022 charge-off							0
2021 charge-off							0
2020 charge-off							0
2019 charge-off							0
Prior, charge-off							0
Revolving loans							86
Chargeoffs							$ 86