Note 5 - Allowance for Loan Losses and Reserve for Unfunded Lending Commitments - Changes in Allowance for Loan Losses and Reserve for Unfunded Lending Commitments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021		Dec. 31, 2020		Dec. 31, 2019
Balance, beginning of year	$ 21,403		$ 13,152		$ 12,805
Provision for (recovery of) loan losses	(2,825)		8,916		456
Charge-offs	(146)		(1,006)		(333)
Recoveries	246		341		224
Balance, end of year	18,678		21,403		13,152
Provision for (recovery of) loan losses	(2,825)		8,916		456
Individually evaluated for impairment	7		30
Collectively evaluated for impairment	18,004		20,534
Loans and Leases Receivable, Allowance, Ending Balance	18,678		21,403		13,152
Individually evaluated for impairment	2,232		2,852
Collectively evaluated for impairment	1,924,546		1,982,003
Loans and Leases Receivable, Net of Deferred Income, Total	1,946,580		2,015,056
Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	839
Balance, end of year	667		839
Loans and Leases Receivable, Allowance, Ending Balance	667		839
Loans and Leases Receivable, Net of Deferred Income, Total	19,802		30,201
Unfunded Loan Commitment [Member]
Balance, beginning of year	304		329		217
Provision for (recovery of) unfunded commitments	82		(25)		112
Charge-offs	0		0		0
Balance, end of year	386		304		329
Commercial Portfolio Segment [Member]
Balance, beginning of year	3,373	[1]	2,657
Provision for (recovery of) loan losses	(745)		1,156
Charge-offs	0	[1]	(505)
Recoveries	40	[1]	65
Balance, end of year	2,668	[1]	3,373	[1]	2,657
Provision for (recovery of) loan losses	(745)		1,156
Individually evaluated for impairment	7	[1]	29
Collectively evaluated for impairment	2,642	[1]	3,318
Loans and Leases Receivable, Allowance, Ending Balance	2,668	[1]	3,373	[1]	2,657
Individually evaluated for impairment	14	[1]	57
Collectively evaluated for impairment	299,470	[1]	490,736
Loans and Leases Receivable, Net of Deferred Income, Total	299,773	[1]	491,256
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	26
Balance, end of year	19	[1]	26
Loans and Leases Receivable, Allowance, Ending Balance	19	[1]	26
Loans and Leases Receivable, Net of Deferred Income, Total	289	[1]	463
Construction and Land Development [Member]
Balance, beginning of year	1,927		1,161
Provision for (recovery of) loan losses	(530)		764
Charge-offs	0		0
Recoveries	0		2
Balance, end of year	1,397		1,927		1,161
Provision for (recovery of) loan losses	(530)		764
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	1,365		1,927
Loans and Leases Receivable, Allowance, Ending Balance	1,397		1,927		1,161
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	133,984		139,833
Loans and Leases Receivable, Net of Deferred Income, Total	134,221		140,071
Construction and Land Development [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	0
Balance, end of year	32		0
Loans and Leases Receivable, Allowance, Ending Balance	32		0
Loans and Leases Receivable, Net of Deferred Income, Total	237		238
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member]
Balance, beginning of year	4,340		2,474
Provision for (recovery of) loan losses	(380)		1,871
Charge-offs	(3)		(17)
Recoveries	7		12
Balance, end of year	3,964		4,340		2,474
Provision for (recovery of) loan losses	(380)		1,871
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	3,767		4,138
Loans and Leases Receivable, Allowance, Ending Balance	3,964		4,340		2,474
Individually evaluated for impairment	8		286
Collectively evaluated for impairment	382,562		360,579
Loans and Leases Receivable, Net of Deferred Income, Total	391,517		373,680
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	202
Balance, end of year	197		202
Loans and Leases Receivable, Allowance, Ending Balance	197		202
Loans and Leases Receivable, Net of Deferred Income, Total	8,947		12,815
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Balance, beginning of year	7,626		3,781
Provision for (recovery of) loan losses	(493)		3,960
Charge-offs	0		(165)
Recoveries	8		50
Balance, end of year	7,141		7,626		3,781
Provision for (recovery of) loan losses	(493)		3,960
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	6,778		7,185
Loans and Leases Receivable, Allowance, Ending Balance	7,141		7,626		3,781
Individually evaluated for impairment	1,185		1,270
Collectively evaluated for impairment	724,180		616,498
Loans and Leases Receivable, Net of Deferred Income, Total	731,034		627,569
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	441
Balance, end of year	363		441
Loans and Leases Receivable, Allowance, Ending Balance	363		441
Loans and Leases Receivable, Net of Deferred Income, Total	5,669		9,801
Residential Portfolio Segment [Member]
Balance, beginning of year	4,067		3,023
Provision for (recovery of) loan losses	(655)		1,076
Charge-offs	(53)		(117)
Recoveries	99		85
Balance, end of year	3,458		4,067		3,023
Provision for (recovery of) loan losses	(655)		1,076
Individually evaluated for impairment	0		1
Collectively evaluated for impairment	3,402		3,896
Loans and Leases Receivable, Allowance, Ending Balance	3,458		4,067		3,023
Individually evaluated for impairment	1,025		1,239
Collectively evaluated for impairment	377,290		365,967
Loans and Leases Receivable, Net of Deferred Income, Total	382,960		374,018
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	170
Balance, end of year	56		170
Loans and Leases Receivable, Allowance, Ending Balance	56		170
Loans and Leases Receivable, Net of Deferred Income, Total	4,645		6,812
Residential Portfolio Segment [Member] | Non-owner Occupied Commercial Real Estate [Member]
Loans and Leases Receivable, Net of Deferred Income, Total	731,034		627,569
Consumer Portfolio Segment [Member]
Balance, beginning of year	70		56
Provision for (recovery of) loan losses	(22)		89
Charge-offs	(90)		(202)
Recoveries	92		127
Balance, end of year	50		70		56
Provision for (recovery of) loan losses	(22)		89
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	50		70
Loans and Leases Receivable, Allowance, Ending Balance	50		70		$ 56
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	7,060		8,390
Loans and Leases Receivable, Net of Deferred Income, Total	7,075		8,462
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member]
Balance, beginning of year	0
Balance, end of year	0		0
Loans and Leases Receivable, Allowance, Ending Balance	0		0
Loans and Leases Receivable, Net of Deferred Income, Total	$ 15		$ 72

[1] Includes PPP loans, which are guaranteed by the SBA and have no related allowance.