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			9 Months Ended
	Jan. 01, 2020		Sep. 30, 2021		Sep. 30, 2020	Sep. 30, 2021		Sep. 30, 2020		Dec. 31, 2020
Beginning balance	$ 26,791	[1]	$ 59,424		$ 47,708	$ 51,920		$ 26,791	[1]
Initial Allowance on PCD Loans			0		0	6,757		1,635
Provision for credit losses			(1,000)		4,418	2,497		15,518
Charge-offs			(2,215)		(1,698)	(5,779)		(1,970)
Recoveries			324		73	1,138		306
Ending balance	36,647	[1]	56,533		50,501	56,533		50,501
Impact of Adopting ASC 326					0			8,221
Loans, individually evaluated for impairment			12,451			12,451				$ 12,531
Allowance for loans, individually evaluated for impairment			2,581			2,581				3,066
Real Estate [Member]
Loans, individually evaluated for impairment			11,491			11,491				12,432
Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			926			926				95
Other Collateral [Member]
Loans, individually evaluated for impairment			34			34				4
Home Equity Line of Credit [Member]
Beginning balance	728		1,230		832	895		728
Initial Allowance on PCD Loans			0		0	147		0
Provision for credit losses			(173)		106	14		96
Charge-offs			0		0	0		0
Recoveries			0		0	1		0
Ending balance	842		1,057		938	1,057		938
Impact of Adopting ASC 326					0			114
Loans, individually evaluated for impairment			181			181				221
Allowance for loans, individually evaluated for impairment			0			0				0
Home Equity Line of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			181			181				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		29,295		25,545	26,379		8,562
Initial Allowance on PCD Loans			0		0	3,603		1,502
Provision for credit losses			(1,451)		1,116	337		12,106
Charge-offs			(1,361)		(1,494)	(4,426)		(1,494)
Recoveries			6		2	596		5
Ending balance	14,552		26,489		25,169	26,489		25,169
Impact of Adopting ASC 326					0			4,488
Loans, individually evaluated for impairment			8,887			8,887				11,681
Allowance for loans, individually evaluated for impairment			2,248			2,248				3,050
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			8,887			8,887				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		19,747		18,839	19,396		5,235
Initial Allowance on PCD Loans			0		0	1,491		152
Provision for credit losses			(3,582)		(558)	(1,692)		9,945
Charge-offs			0		(143)	(3,065)		(143)
Recoveries			6		2	41		5
Ending balance	8,333		16,171		18,140	16,171		18,140
Impact of Adopting ASC 326					0			2,946
Loans, individually evaluated for impairment			771			771				10,278
Allowance for loans, individually evaluated for impairment			35			35				3,037
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			771			771				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		9,548		6,706	6,983		3,327
Initial Allowance on PCD Loans			0		0	2,112		1,350
Provision for credit losses			2,131		1,674	2,029		2,161
Charge-offs			(1,361)		(1,351)	(1,361)		(1,351)
Recoveries			0		0	555		0
Ending balance	6,219		10,318		7,029	10,318		7,029
Impact of Adopting ASC 326					0			1,542
Loans, individually evaluated for impairment			8,116			8,116				1,403
Allowance for loans, individually evaluated for impairment			2,213			2,213				13
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			8,116			8,116				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			926			926				111
Allowance for loans, individually evaluated for impairment			217			217				16
Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				16
Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			926			926				95
Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial and Industrial Portfolio Segment [Member] | Term [Member]
Beginning balance	6,782		9,748	[2]	7,339	8,970	[2]	6,782
Initial Allowance on PCD Loans			0	[2]	0	1,022	[2]	0
Provision for credit losses			253	[2]	1,605	156	[2]	1,790
Charge-offs			(240)	[2]	(1)	(409)	[2]	(1)
Recoveries			5	[2]	1	27	[2]	8
Ending balance			9,766	[2]	8,944	9,766	[2]	8,944
Impact of Adopting ASC 326					0			365
Loans, individually evaluated for impairment			926			926				23
Allowance for loans, individually evaluated for impairment			217			217				16
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				16
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment			926			926				7
Commercial and Industrial Portfolio Segment [Member] | Term [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment			0			0				0
Commercial and Industrial Portfolio Segment [Member] | Lines of Credit [Member]
Beginning balance	5,657		5,240		3,242	3,614		5,657
Initial Allowance on PCD Loans			0		0	1,755		0
Provision for credit losses			(328)		179	(457)		(708)
Charge-offs			0		0	0		0
Recoveries			0		0	0		0
Ending balance	4,129		4,912		3,421	4,912		3,421
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		14,988		10,581	12,584		12,439
Initial Allowance on PCD Loans			0		0	2,777		0
Provision for credit losses			(75)		1,784	(301)		1,082
Charge-offs			(240)		(1)	(409)		(1)
Recoveries			5		1	27		8
Ending balance	11,276		14,678		12,365	14,678		12,365
Impact of Adopting ASC 326					0			(1,163)
Residential Real Estate Portfolio Segment [Member]
Beginning balance	2,474		7,772		4,442	5,207		2,474
Initial Allowance on PCD Loans			0		0	230		99
Provision for credit losses			526		882	2,899		1,251
Charge-offs			(340)		(63)	(383)		(81)
Recoveries			29		13	34		15
Ending balance	4,089		7,987		5,274	7,987		5,274
Impact of Adopting ASC 326					0			1,516
Loans, individually evaluated for impairment			2,423			2,423				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			2,423			2,423				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		3,422		1,594	1,818		947
Initial Allowance on PCD Loans			0		0	88		0
Provision for credit losses			106		418	1,620		636
Charge-offs			0		(2)	0		(2)
Recoveries			2		0	4		0
Ending balance	1,376		3,530		2,010	3,530		2,010
Impact of Adopting ASC 326					0			429
Loans, individually evaluated for impairment			511			511				101
Allowance for loans, individually evaluated for impairment			116			116				0
Residential Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			511			511				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		4,350		2,848	3,389		1,527
Initial Allowance on PCD Loans			0		0	142		99
Provision for credit losses			420		464	1,279		615
Charge-offs			(340)		(61)	(383)		(79)
Recoveries			27		13	30		15
Ending balance	2,713		4,457		3,264	4,457		3,264
Impact of Adopting ASC 326					0			1,087
Loans, individually evaluated for impairment			1,912			1,912				413
Allowance for loans, individually evaluated for impairment			0			0				0
Residential Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			1,912			1,912				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		5,193		5,608	6,119		2,105
Initial Allowance on PCD Loans			0		0	0		0
Provision for credit losses			45		420	(884)		867
Charge-offs			0		0	0		0
Recoveries			0		0	3		0
Ending balance	5,161		5,238		6,028	5,238		6,028
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		572		362	340		100
Initial Allowance on PCD Loans			0		0	0		34
Provision for credit losses			145		57	471		54
Charge-offs			(274)		(140)	(561)		(394)
Recoveries			284		57	477		278
Ending balance	398		727		336	727		336
Impact of Adopting ASC 326					0			264
Loans, individually evaluated for impairment			34			34				4
Allowance for loans, individually evaluated for impairment			0			0				0
Consumer Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment			0			0				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			34			34				4
Finance Leases Portfolio Segment [Member]
Beginning balance	237		232		223	261		237
Initial Allowance on PCD Loans			0		0	0		0
Provision for credit losses			(38)		34	(67)		24
Charge-offs			0		0	0		0
Recoveries			0		0	0		0
Ending balance	233		194		257	194		257
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		142		115	135		146
Initial Allowance on PCD Loans			0		0	0		0
Provision for credit losses			21		19	28		38
Charge-offs			0		0	0		0
Recoveries			0		0	0		0
Ending balance			163		134	163		134
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.