Note 5 - Loans - Allowance for Credit Losses and Recorded Investment in Financing Receivables (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Balance		$ 12,231	$ 12,292
Charge-offs		(1,113)	(1,500)
Recoveries		542	1,439
Provision for loan and lease losses		5,250	0
Individually evaluated for impairment				$ 192	$ 324
Collectively evaluated for impairment				16,718	11,907
Total		12,231	12,292	16,910	12,231
Individually evaluated for impairment				11,103	10,399
Collectively evaluated for impairment				1,128,629	1,022,504
Total gross loans				1,139,732	1,032,903
SBA CARES Act Paycheck Protection Program [Member]
Balance	[1]	0	0
Charge-offs	[1]	0	0
Recoveries	[1]	0	0
Provision for loan and lease losses	[1]	0	0
Individually evaluated for impairment	[1]			0	0
Collectively evaluated for impairment	[1]			0	0
Total	[1]	0	0	0	0
Individually evaluated for impairment	[1]			0	0
Collectively evaluated for impairment	[1]			130,814	0
Total gross loans	[1]			130,814	0
Commercial Portfolio Segment [Member]
Balance		1,822	2,205
Charge-offs		(353)	(238)
Recoveries		24	927
Provision for loan and lease losses		909	(1,072)
Individually evaluated for impairment				114	159
Collectively evaluated for impairment				2,288	1,663
Total		1,822	2,205	2,402	1,822
Individually evaluated for impairment				2,033	656
Collectively evaluated for impairment				113,526	140,541
Total gross loans				115,559	141,197
Commercial Portfolio Segment [Member] | SBA CARES Act Paycheck Protection Program [Member]
Total gross loans				130,814
Commercial Real Estate Portfolio Segment [Member]
Balance		8,096	7,116
Charge-offs		(144)	(233)
Recoveries		34	0
Provision for loan and lease losses		3,909	1,213
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				11,895	8,096
Total		8,096	7,116	11,895	8,096
Individually evaluated for impairment				3,734	3,103
Collectively evaluated for impairment				763,802	736,480
Total gross loans				767,536	739,583
Residential Portfolio Segment [Member]
Balance		1,032	1,173
Charge-offs		(66)	(181)
Recoveries		154	261
Provision for loan and lease losses		204	(221)
Individually evaluated for impairment				74	154
Collectively evaluated for impairment				1,250	878
Total		1,032	1,173	1,324	1,032
Individually evaluated for impairment				5,318	6,600
Collectively evaluated for impairment				98,536	112,199
Total gross loans				103,854	118,799
Consumer Portfolio Segment [Member]
Balance		933	1,356
Charge-offs		(550)	(848)
Recoveries		330	251
Provision for loan and lease losses		(30)	174
Individually evaluated for impairment				4	11
Collectively evaluated for impairment				679	922
Total		933	1,356	683	933
Individually evaluated for impairment				18	40
Collectively evaluated for impairment				21,951	33,284
Total gross loans				21,969	33,324
Unallocated Financing Receivables [Member]
Balance		348	442
Charge-offs		0	0
Recoveries		0	0
Provision for loan and lease losses		258	(94)
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				606	348
Total		$ 348	$ 442	606	348
Individually evaluated for impairment				0	0
Collectively evaluated for impairment				0	0
Total gross loans				$ 0	$ 0

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