Note 5 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Provision for (reversal of) credit losses - loans	$ 3,245	$ 2,939	$ 4,217	$ 4,478
Commercial Portfolio Segment [Member]
Balance	26,162	25,459	28,903	25,969
Charge-offs	(1,100)	(292)	(3,867)	(341)
Recoveries	9	0	9	1
Provision for (reversal of) credit losses - loans	4,255	2,968	4,281	2,506
Balance	29,326	28,135	29,326	28,135
Commercial Real Estate Portfolio Segment [Member]
Balance	53,000	47,868	53,742	45,589
Charge-offs	0	(1)	(1,717)	(226)
Recoveries	0	0	0	0
Provision for (reversal of) credit losses - loans	(491)	(305)	484	2,199
Balance	52,509	47,562	52,509	47,562
Commercial Construction Portfolio Segment [Member]
Balance	3,966	3,281	3,718	3,580
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (reversal of) credit losses - loans	(420)	132	(172)	(167)
Balance	3,546	3,413	3,546	3,413
Residential Portfolio Segment [Member]
Balance	3,868	3,455	4,143	3,628
Charge-offs	(18)	(9)	(18)	(9)
Recoveries	67	32	68	63
Provision for (reversal of) credit losses - loans	(98)	147	(374)	(57)
Balance	3,819	3,625	3,819	3,625
Consumer Portfolio Segment [Member]
Balance	6	7	7	7
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for (reversal of) credit losses - loans	(1)	(3)	(2)	(3)
Balance	5	4	5	4
Unallocated Financing Receivables [Member]
Balance	87,002	80,070	90,513	78,773
Charge-offs	(1,118)	(302)	(5,602)	(576)
Recoveries	76	32	77	64
Provision for (reversal of) credit losses - loans	3,245	2,939	4,217	4,478
Balance	$ 89,205	$ 82,739	$ 89,205	$ 82,739