Note 4 - Loans - Allowance for Credit Losses and Recorded Investment in Financing Receivables (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Balance		$ 17,027	$ 15,067	$ 16,910	$ 12,231
Charge-offs		(72)	(356)	(162)	(525)
Recoveries		239
Provision for loan and lease losses		0	1,300	0	4,150
Balance		17,194	16,089	17,194	16,089
Recoveries			78	446	233
Individually evaluated for impairment		159		159		$ 192
Collectively evaluated for impairment		17,035		17,035		16,718
Total		17,194	16,089	17,194	16,089	16,910
Individually evaluated for impairment		7,729		7,729		11,103
Collectively evaluated for impairment		1,083,016		1,083,016		1,128,629
Total gross loans		1,090,745		1,090,745		1,139,732
SBA CARES Act Paycheck Protection Program [Member]
Balance	[1]	0	0	0	0
Charge-offs	[1]	0	0	0	0
Recoveries	[1]	0
Provision for loan and lease losses	[1]	0	0	0	0
Balance	[1]	0	0	0	0
Recoveries	[1]		0	0	0
Individually evaluated for impairment	[1]	0		0		0
Collectively evaluated for impairment	[1]	0		0		0
Total	[1]	0	0	0	0	0
Individually evaluated for impairment	[1]	0		0		0
Collectively evaluated for impairment	[1]	59,058		59,058		130,814
Total gross loans	[1]	59,058		59,058		130,814
Commercial Portfolio Segment [Member]
Balance		2,366	2,483	2,402	1,822
Charge-offs		0	0	0	0
Recoveries		(5)
Provision for loan and lease losses		(522)	(97)	(568)	556
Balance		1,839	2,400	1,839	2,400
Recoveries			14	5	22
Individually evaluated for impairment		99		99		114
Collectively evaluated for impairment		1,740		1,740		2,288
Total		1,839	2,400	1,839	2,400	2,402
Individually evaluated for impairment		1,936		1,936		2,033
Collectively evaluated for impairment		91,714		91,714		113,526
Total gross loans		93,650		93,650		115,559
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member]
Total gross loans		59,058		59,058		130,814
Commercial Real Estate Portfolio Segment [Member]
Balance		12,253	9,899	11,895	8,096
Charge-offs		0	(145)	0	(145)
Recoveries		0
Provision for loan and lease losses		659	1,182	907	2,985
Balance		12,912	10,936	12,912	10,936
Recoveries			0	110	0
Individually evaluated for impairment		0		0		0
Collectively evaluated for impairment		12,912		12,912		11,895
Total		12,912	10,936	12,912	10,936	11,895
Individually evaluated for impairment		695		695		3,734
Collectively evaluated for impairment		824,914		824,914		763,802
Total gross loans		825,609		825,609		767,536
Residential Portfolio Segment [Member]
Balance		1,221	1,281	1,324	1,032
Charge-offs		(18)	(29)	(40)	(35)
Recoveries		158
Provision for loan and lease losses		(201)	36	(307)	247
Balance		1,160	1,306	1,160	1,306
Recoveries			18	183	62
Individually evaluated for impairment		56		56		74
Collectively evaluated for impairment		1,104		1,104		1,250
Total		1,160	1,306	1,160	1,306	1,324
Individually evaluated for impairment		5,082		5,082		5,318
Collectively evaluated for impairment		89,916		89,916		98,536
Total gross loans		94,998		94,998		103,854
Consumer Portfolio Segment [Member]
Balance		557	972	683	933
Charge-offs		(54)	(182)	(122)	(345)
Recoveries		86
Provision for loan and lease losses		(120)	34	(240)	133
Balance		469	870	469	870
Recoveries			46	148	149
Individually evaluated for impairment		4		4		4
Collectively evaluated for impairment		465		465		679
Total		469	870	469	870	683
Individually evaluated for impairment		16		16		18
Collectively evaluated for impairment		17,414		17,414		21,951
Total gross loans		17,430		17,430		21,969
Unallocated Financing Receivables [Member]
Balance		630	432	606	348
Charge-offs		0	0	0	0
Recoveries		0
Provision for loan and lease losses		184	145	208	229
Balance		814	577	814	577
Recoveries			0	0	0
Individually evaluated for impairment		0		0		0
Collectively evaluated for impairment		814		814		606
Total		814	$ 577	814	$ 577	606
Individually evaluated for impairment		0		0		0
Collectively evaluated for impairment		0		0		0
Total gross loans		$ 0		$ 0		$ 0

[1] PPP loans are fully guaranteed by SBA and no allowance is provided for them.