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, 2022	Mar. 31, 2021	Dec. 31, 2021
Beginning balance	$ 53,898	$ 51,920
Initial Allowance on PCD Loans	9,950
Provision for credit losses	2,679	(1,200)
Charge-offs	(409)	(122)
Recoveries	949	116
Ending balance	67,067	50,714
Loans, individually evaluated for impairment	28,806		$ 12,562
Allowance for loans, individually evaluated for impairment	6,631		1,768
Real Estate [Member]
Loans, individually evaluated for impairment	21,527		11,517
Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	2,219		798
Other Collateral [Member]
Loans, individually evaluated for impairment	5,060		247
Home Equity Line of Credit [Member]
Beginning balance	1,044	895
Initial Allowance on PCD Loans	2
Provision for credit losses	421	(52)
Charge-offs	0	0
Recoveries	0	0
Ending balance	1,467	843
Loans, individually evaluated for impairment	481		646
Allowance for loans, individually evaluated for impairment	2		0
Home Equity Line of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	481		646
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
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	25,555	26,379
Initial Allowance on PCD Loans	5,629
Provision for credit losses	729	717
Charge-offs	0	0
Recoveries	33	31
Ending balance	31,946	27,127
Loans, individually evaluated for impairment	12,942		8,372
Allowance for loans, individually evaluated for impairment	2,984		1,652
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	12,942		8,372
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] | Non-owner Occupied [Member]
Beginning balance	15,960	19,396
Initial Allowance on PCD Loans	3,508
Provision for credit losses	1,140	635
Charge-offs	0	0
Recoveries	12	31
Ending balance	20,620	20,062
Loans, individually evaluated for impairment	4,705		720
Allowance for loans, individually evaluated for impairment	588		0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	4,705		720
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] | Owner Occupied [Member]
Beginning balance	9,595	6,983
Initial Allowance on PCD Loans	2,121
Provision for credit losses	(411)	82
Charge-offs	0	0
Recoveries	21	0
Ending balance	11,326	7,065
Loans, individually evaluated for impairment	8,237		7,652
Allowance for loans, individually evaluated for impairment	2,396		1,652
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	8,237		7,652
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 and Industrial Portfolio Segment [Member]
Loans, individually evaluated for impairment	7,864		798
Allowance for loans, individually evaluated for impairment	2,760		0
Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	752		0
Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	2,219		798
Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	4,893		0
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Beginning balance	8,577	8,970
Initial Allowance on PCD Loans	1,358
Provision for credit losses	567	(452)
Charge-offs	(113)	(55)
Recoveries	719	6
Ending balance	11,108	8,469
Loans, individually evaluated for impairment	3,355		598
Allowance for loans, individually evaluated for impairment	1,358		0
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	752		0
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	666		598
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	1,937		0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Beginning balance	4,802	3,614
Initial Allowance on PCD Loans	1,874
Provision for credit losses	(132)	(631)
Charge-offs	(36)	0
Recoveries	0	0
Ending balance	6,508	2,983
Loans, individually evaluated for impairment	4,509		200
Allowance for loans, individually evaluated for impairment	1,402		0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	1,553		200
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	2,956		0
Total Commercial and Industrial Portfolio Segment [Member]
Beginning balance	13,379	12,584
Initial Allowance on PCD Loans	3,232
Provision for credit losses	435	(1,083)
Charge-offs	(149)	(55)
Recoveries	719	6
Ending balance	17,616	11,452
Residential Real Estate Portfolio Segment [Member]
Beginning balance	7,993	5,207
Initial Allowance on PCD Loans	590
Provision for credit losses	141	(204)
Charge-offs	(6)	(3)
Recoveries	6	1
Ending balance	8,724	5,001
Loans, individually evaluated for impairment	3,713		2,499
Allowance for loans, individually evaluated for impairment	446		116
Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,713		2,499
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] | Non-owner Occupied [Member]
Beginning balance	3,677	1,818
Initial Allowance on PCD Loans	0
Provision for credit losses	(319)	(110)
Charge-offs	0	0
Recoveries	3	0
Ending balance	3,361	1,708
Loans, individually evaluated for impairment	489		502
Allowance for loans, individually evaluated for impairment	116		116
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	489		502
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] | Owner Occupied [Member]
Beginning balance	4,316	3,389
Initial Allowance on PCD Loans	590
Provision for credit losses	460	(94)
Charge-offs	(6)	(3)
Recoveries	3	1
Ending balance	5,363	3,293
Loans, individually evaluated for impairment	3,224		1,997
Allowance for loans, individually evaluated for impairment	330		0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,224		1,997
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
Construction and Development [Member]
Beginning balance	4,789	6,119
Initial Allowance on PCD Loans	419
Provision for credit losses	656	(592)
Charge-offs	0	0
Recoveries	0	0
Ending balance	5,864	5,527
Loans, individually evaluated for impairment	3,639		0
Allowance for loans, individually evaluated for impairment	419		0
Construction and Development [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,639		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
Consumer Portfolio Segment [Member]
Beginning balance	772	340
Initial Allowance on PCD Loans	78
Provision for credit losses	262	41
Charge-offs	(254)	(64)
Recoveries	191	78
Ending balance	1,049	395
Loans, individually evaluated for impairment	167		247
Allowance for loans, individually evaluated for impairment	20		0
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	167		247
Finance Leases Portfolio Segment [Member]
Beginning balance	204	261
Initial Allowance on PCD Loans	0
Provision for credit losses	7	(26)
Charge-offs	0	0
Recoveries	0	0
Ending balance	211	235
Loans, individually evaluated for impairment	0		0
Allowance for loans, individually evaluated for impairment	0		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
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Beginning balance	162	135
Initial Allowance on PCD Loans	0
Provision for credit losses	28	(1)
Charge-offs	0	0
Recoveries	0	0
Ending balance	190	$ 134
Loans, individually evaluated for impairment	0		0
Allowance for loans, individually evaluated for impairment	0		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