Note 5 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Provision for (reversal of) credit losses - loans	$ 1,504	$ 9,338	$ 5,721	$ 13,816
Commercial Portfolio Segment [Member]
Balance	29,326	28,135	28,903	25,969
Charge-offs	(2,250)	(410)	(6,117)	(751)
Recoveries	0	53	9	54
Provision for (reversal of) credit losses - loans	775	1,911	5,056	4,417
Balance	27,851	29,689	27,851	29,689
Commercial Real Estate Portfolio Segment [Member]
Balance	52,509	47,562	53,742	45,589
Charge-offs	(237)	0	(1,954)	(226)
Recoveries	0	0	0	0
Provision for (reversal of) credit losses - loans	461	6,964	945	9,163
Balance	52,733	54,526	52,733	54,526
Commercial Construction Portfolio Segment [Member]
Balance	3,546	3,413	3,718	3,580
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (reversal of) credit losses - loans	363	31	191	(136)
Balance	3,909	3,444	3,909	3,444
Residential Portfolio Segment [Member]
Balance	3,819	3,625	4,143	3,628
Charge-offs	0	0	(18)	(9)
Recoveries	1	0	69	63
Provision for (reversal of) credit losses - loans	(88)	428	(462)	371
Balance	3,732	4,053	3,732	4,053
Consumer Portfolio Segment [Member]
Balance	5	4	7	7
Charge-offs	0	(3)	0	(3)
Recoveries	7	0	7	0
Provision for (reversal of) credit losses - loans	(7)	4	(9)	1
Balance	5	5	5	5
Unallocated Financing Receivables [Member]
Balance	89,205	82,739	90,513	78,773
Charge-offs	(2,487)	(413)	(8,089)	(989)
Recoveries	8	53	85	117
Provision for (reversal of) credit losses - loans	1,504	9,338	5,721	13,816
Balance	$ 88,230	$ 91,717	$ 88,230	$ 91,717