Note 4 - Loans and Allowance for Credit Losses on Loans - Allowance for Loan Losses by Portfolio Segment and Based on Impairment Evaluation Method (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Beginning balance	$ 73,531	$ 53,898
Provision for credit losses	2,250	2,679
Charge-offs	(370)	(409)
Recoveries	262	949
Ending balance	75,673	67,067
Initial Allowance on PCD Loans		9,950
Real Estate [Member]
Loans, individually evaluated for impairment	28,073		$ 22,459
Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	499		5,028
Other Collateral [Member]
Loans, individually evaluated for impairment	1,012		219
Collateral Pledged [Member]
Loans, individually evaluated for impairment	29,584		27,706
Allowance for loans, individually evaluated for impairment	5,774		5,822
Home Equity Line of Credit [Member]
Beginning balance	1,613	1,044
Provision for credit losses	17	421
Charge-offs	(12)	0
Recoveries	0	0
Ending balance	1,618	1,467
Initial Allowance on PCD Loans		2
Home Equity Line of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	100		205
Home Equity Line of Credit [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Home Equity Line of Credit [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Home Equity Line of Credit [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	100		205
Allowance for loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	33,468	25,555
Provision for credit losses	(389)	729
Charge-offs	0	0
Recoveries	19	33
Ending balance	33,098	31,946
Initial Allowance on PCD Loans		5,629
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	17,493		19,179
Commercial Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	17,493		19,179
Allowance for loans, individually evaluated for impairment	3,202		3,498
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Beginning balance	22,641	15,960
Provision for credit losses	(991)	1,140
Charge-offs	0	0
Recoveries	19	12
Ending balance	21,669	20,620
Initial Allowance on PCD Loans		3,508
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	14,336		14,764
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	14,336		14,764
Allowance for loans, individually evaluated for impairment	2,357		2,652
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Beginning balance	10,827	9,595
Provision for credit losses	602	(411)
Charge-offs	0	0
Recoveries	0	21
Ending balance	11,429	11,326
Initial Allowance on PCD Loans		2,121
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,157		4,415
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	3,157		4,415
Allowance for loans, individually evaluated for impairment	845		846
Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	7,318		461
Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	499		5,028
Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	742		0
Commercial and Industrial Portfolio Segment [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	8,559		5,489
Allowance for loans, individually evaluated for impairment	2,219		1,966
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Beginning balance	12,991	8,577
Provision for credit losses	991	567
Charge-offs	(71)	(113)
Recoveries	87	719
Ending balance	13,982	11,108
Initial Allowance on PCD Loans		1,358
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	4,541		39
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	330		2,207
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	470		0
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	5,341		2,246
Allowance for loans, individually evaluated for impairment	1,463		1,205
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Beginning balance	6,389	4,802
Provision for credit losses	(364)	(132)
Charge-offs	0	(36)
Recoveries	0	0
Ending balance	6,041	6,508
Initial Allowance on PCD Loans		1,874
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	2,777		422
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	169		2,821
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	272		0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	3,218		3,243
Allowance for loans, individually evaluated for impairment	756		761
Total Commercial and Industrial Portfolio Segment [Member]
Beginning balance	19,380	13,379
Provision for credit losses	627	435
Charge-offs	(71)	(149)
Recoveries	87	719
Ending balance	20,023	17,616
Initial Allowance on PCD Loans		3,232
Residential Real Estate Portfolio Segment [Member]
Beginning balance	10,314	7,993
Provision for credit losses	2,024	141
Charge-offs	0	(6)
Recoveries	11	6
Ending balance	12,349	8,724
Initial Allowance on PCD Loans		590
Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,162		2,614
Residential Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Residential Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Residential Real Estate Portfolio Segment [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	3,162		2,614
Allowance for loans, individually evaluated for impairment	333		338
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Beginning balance	3,597	3,677
Provision for credit losses	546	(319)
Charge-offs	0	0
Recoveries	1	3
Ending balance	4,144	3,361
Initial Allowance on PCD Loans		0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	584		415
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	584		415
Allowance for loans, individually evaluated for impairment	116		116
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Beginning balance	6,717	4,316
Provision for credit losses	1,478	460
Charge-offs	0	(6)
Recoveries	10	3
Ending balance	8,205	5,363
Initial Allowance on PCD Loans		590
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	2,578		2,199
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	2,578		2,199
Allowance for loans, individually evaluated for impairment	217		222
Construction and Development [Member]
Beginning balance	7,186	4,789
Provision for credit losses	(451)	656
Charge-offs	0	0
Recoveries	0	0
Ending balance	6,735	5,864
Initial Allowance on PCD Loans		419
Construction and Development [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0
Construction and Development [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Construction and Development [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Construction and Development [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	0		0
Allowance for loans, individually evaluated for impairment	0		0
Consumer Portfolio Segment [Member]
Beginning balance	1,158	772
Provision for credit losses	88	262
Charge-offs	(199)	(254)
Recoveries	139	191
Ending balance	1,186	1,049
Initial Allowance on PCD Loans		78
Consumer Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0
Consumer Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Consumer Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	270		219
Consumer Portfolio Segment [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	270		219
Allowance for loans, individually evaluated for impairment	20		20
Finance Leases Portfolio Segment [Member]
Beginning balance	201	204
Provision for credit losses	(2)	7
Charge-offs	0	0
Recoveries	0	0
Ending balance	199	211
Initial Allowance on PCD Loans		0
Finance Leases Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0
Finance Leases Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Finance Leases Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Finance Leases Portfolio Segment [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	0		0
Allowance for loans, individually evaluated for impairment	0		0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Beginning balance	211	162
Provision for credit losses	336	28
Charge-offs	(88)	0
Recoveries	6	0
Ending balance	465	190
Initial Allowance on PCD Loans		$ 0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Collateral Pledged [Member]
Loans, individually evaluated for impairment	0		0
Allowance for loans, individually evaluated for impairment	$ 0		$ 0