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			6 Months Ended
	Jan. 01, 2020		Jun. 30, 2021		Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020		Dec. 31, 2020
Beginning balance	$ 26,791	[1]	$ 50,714		$ 42,143	$ 51,920		$ 26,791	[1]
Initial Allowance on PCD Loans			6,757		0	6,757		1,635
Provision for credit losses			4,697		5,550	3,497		11,100
Charge-offs			(3,442)		(98)	(3,564)		(272)
Recoveries			698		113	814		233
Ending balance	36,647	[1]	59,424		47,708	59,424		47,708
Impact of Adopting ASC 326					0			8,221
Loans, individually evaluated for impairment			19,128			19,128				$ 12,531
Allowance for loans, individually evaluated for impairment			4,164			4,164				3,066
Real Estate [Member]
Loans, individually evaluated for impairment			18,060			18,060				12,432
Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			1,010			1,010				95
Other Collateral [Member]
Loans, individually evaluated for impairment			58			58				3
Home Equity Line of Credit [Member]
Beginning balance	728		843		623	895		728
Initial Allowance on PCD Loans			147		0	147		0
Provision for credit losses			239		209	187		(10)
Charge-offs			0		0	0		0
Recoveries			1		0	1		0
Ending balance	842		1,230		832	1,230		832
Impact of Adopting ASC 326					0			114
Loans, individually evaluated for impairment			366			366				221
Allowance for loans, individually evaluated for impairment			100			100				0
Home Equity Line of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			366			366				221
Home Equity Line of Credit [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Home Equity Line of Credit [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	8,562		27,127		19,944	26,379		8,562
Initial Allowance on PCD Loans			3,603		0	3,603		1,502
Provision for credit losses			1,071		5,600	1,788		10,990
Charge-offs			(3,065)		0	(3,065)		0
Recoveries			559		1	590		3
Ending balance	14,552		29,295		25,545	29,295		25,545
Impact of Adopting ASC 326					0			4,488
Loans, individually evaluated for impairment			15,715			15,715				11,681
Allowance for loans, individually evaluated for impairment			3,549			3,549				3,050
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			15,715			15,715				11,681
Commercial Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Beginning balance	5,235		20,062		13,435	19,396		5,235
Initial Allowance on PCD Loans			1,491		0	1,491		152
Provision for credit losses			1,255		5,403	1,890		10,503
Charge-offs			(3,065)		0	(3,065)		0
Recoveries			4		1	35		3
Ending balance	8,333		19,747		18,839	19,747		18,839
Impact of Adopting ASC 326					0			2,946
Loans, individually evaluated for impairment			9,600			9,600				10,278
Allowance for loans, individually evaluated for impairment			1,449			1,449				3,037
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			9,600			9,600				10,278
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Beginning balance	3,327		7,065		6,509	6,983		3,327
Initial Allowance on PCD Loans			2,112		0	2,112		1,350
Provision for credit losses			(184)		197	(102)		487
Charge-offs			0		0	0		0
Recoveries			555		0	555		0
Ending balance	6,219		9,548		6,706	9,548		6,706
Impact of Adopting ASC 326					0			1,542
Loans, individually evaluated for impairment			6,115			6,115				1,403
Allowance for loans, individually evaluated for impairment			2,100			2,100				13
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			6,115			6,115				1,403
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial and Industrial Portfolio Segment [Member]
Loans, individually evaluated for impairment			1,082			1,082				111
Allowance for loans, individually evaluated for impairment			399			399				16
Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			14			14				16
Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			1,010			1,010				95
Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			58			58				0
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Beginning balance	6,782		8,469	[2]	7,990	8,970	[2]	6,782
Initial Allowance on PCD Loans			1,022	[2]	0	1,022	[2]	0
Provision for credit losses			355	[2]	(651)	(97)	[2]	185
Charge-offs			(114)	[2]	0	(169)	[2]	0
Recoveries			16	[2]	0	22	[2]	7
Ending balance			9,748	[2]	7,339	9,748	[2]	7,339
Impact of Adopting ASC 326					0			365
Loans, individually evaluated for impairment			1,082			1,082				23
Allowance for loans, individually evaluated for impairment			399			399				16
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			14			14				16
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			1,010			1,010				7
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			58			58				0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Beginning balance	5,657		2,983		3,866	3,614		5,657
Initial Allowance on PCD Loans			1,755		0	1,755		0
Provision for credit losses			502		(624)	(129)		(887)
Charge-offs			0		0	0		0
Recoveries			0		0	0		0
Ending balance	4,129		5,240		3,242	5,240		3,242
Impact of Adopting ASC 326					0			(1,528)
Loans, individually evaluated for impairment			0			0				88
Allowance for loans, individually evaluated for impairment			0			0				0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				88
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Total Commercial and Industrial Portfolio Segment [Member]
Beginning balance	12,439		11,452		11,856	12,584		12,439
Initial Allowance on PCD Loans			2,777		0	2,777		0
Provision for credit losses			857		(1,275)	(226)		(702)
Charge-offs			(114)		0	(169)		0
Recoveries			16		0	22		7
Ending balance	11,276		14,988		10,581	14,988		10,581
Impact of Adopting ASC 326					0			(1,163)
Residential Real Estate Portfolio Segment [Member]
Beginning balance	2,474		5,001		4,121	5,207		2,474
Initial Allowance on PCD Loans			230		0	230		99
Provision for credit losses			2,577		337	2,373		369
Charge-offs			(40)		(18)	(43)		(18)
Recoveries			4		2	5		2
Ending balance	4,089		7,772		4,442	7,772		4,442
Impact of Adopting ASC 326					0			1,516
Loans, individually evaluated for impairment			1,958			1,958				514
Allowance for loans, individually evaluated for impairment			116			116				0
Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			1,958			1,958				514
Residential Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]
Beginning balance	947		1,709		1,419	1,818		947
Initial Allowance on PCD Loans			88		0	88		0
Provision for credit losses			1,624		175	1,514		218
Charge-offs			0		0	0		0
Recoveries			1		0	2		0
Ending balance	1,376		3,422		1,594	3,422		1,594
Impact of Adopting ASC 326					0			429
Loans, individually evaluated for impairment			154			154				101
Allowance for loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			154			154				101
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Beginning balance	1,527		3,292		2,702	3,389		1,527
Initial Allowance on PCD Loans			142		0	142		99
Provision for credit losses			953		162	859		151
Charge-offs			(40)		(18)	(43)		(18)
Recoveries			3		2	3		2
Ending balance	2,713		4,350		2,848	4,350		2,848
Impact of Adopting ASC 326					0			1,087
Loans, individually evaluated for impairment			1,804			1,804				413
Allowance for loans, individually evaluated for impairment			116			116				0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			1,804			1,804				413
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Construction and Development [Member]
Beginning balance	2,105		5,527		5,185	6,119		2,105
Initial Allowance on PCD Loans			0		0	0		0
Provision for credit losses			(337)		423	(929)		447
Charge-offs			0		0	0		0
Recoveries			3		0	3		0
Ending balance	5,161		5,193		5,608	5,193		5,608
Impact of Adopting ASC 326					0			3,056
Loans, individually evaluated for impairment			0			0				0
Allowance for loans, individually evaluated for impairment			0			0				0
Construction and Development [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				0
Construction and Development [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Construction and Development [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Consumer Portfolio Segment [Member]
Beginning balance	100		395		198	340		100
Initial Allowance on PCD Loans			0		0	0		34
Provision for credit losses			285		134	326		(3)
Charge-offs			(223)		(80)	(287)		(254)
Recoveries			115		110	193		221
Ending balance	398		572		362	572		362
Impact of Adopting ASC 326					0			264
Loans, individually evaluated for impairment			7			7				4
Allowance for loans, individually evaluated for impairment			0			0				0
Consumer Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			7			7				0
Consumer Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Consumer Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				4
Finance Leases Portfolio Segment [Member]
Beginning balance	237		235		159	261		237
Initial Allowance on PCD Loans			0		0	0		0
Provision for credit losses			(3)		64	(29)		(10)
Charge-offs			0		0	0		0
Recoveries			0		0	0		0
Ending balance	233		232		223	232		223
Impact of Adopting ASC 326					0			(4)
Loans, individually evaluated for impairment			0			0				0
Allowance for loans, individually evaluated for impairment			0			0				0
Finance Leases Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				0
Finance Leases Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Finance Leases Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Portfolio Segment [Member]
Beginning balance	146							146
Ending balance	96
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member]
Beginning balance	$ 146		134		57	135		146
Initial Allowance on PCD Loans			0		0	0		0
Provision for credit losses			8		58	7		19
Charge-offs			0		0	0		0
Recoveries			0		0	0		0
Ending balance			142		115	142		115
Impact of Adopting ASC 326					$ 0			$ (50)
Loans, individually evaluated for impairment			0			0				0
Allowance for loans, individually evaluated for impairment			0			0				0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial Portfolio Segment [Member] | Credit Card Receivable [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			$ 0			$ 0				$ 0

[1] The impact of the ASC 326 adoption on the ACL on loans reflects $8.2 million related to the transition from the incurred loss ACL model to the CECL ACL model and $1.6 million related to the transition from PCI to PCD methodology as defined in the standard.

[2] The allowance allocated for the commercial & industrial –term segment includes $813,000 related to PCD PPP loans.