Note 9 - Allowance for Loan Losses and Credit Quality Information - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Balance	$ 9,915	$ 8,649	$ 10,699	$ 8,564
Provision for losses	(886)	770	(2,353)	1,548
Recoveries	41	150	766	232
Charge-offs		(37)	(42)	(812)
Balance	9,070	9,532	9,070	9,532
Specific reserves	286		286		$ 238
General reserves	8,784		8,784		10,461
Balance	9,070	9,532	9,070	9,532	10,699
Individually reviewed for impairment	1,871		1,871		3,126
Collectively reviewed for impairment	629,827		629,827		650,665
Ending balance	631,698		631,698		653,791
Residential Portfolio Segment [Member]
Balance	929	938	1,030	857
Provision for losses	13	27	(88)	108
Recoveries	0	0	0	0
Charge-offs		0	0	0
Balance	942	965	942	965
Specific reserves	38		38		29
General reserves	904		904		1,001
Balance	942	965	942	965	1,030
Individually reviewed for impairment	445		445		857
Collectively reviewed for impairment	157,057		157,057		134,166
Ending balance	157,502		157,502		135,023
Commercial Real Estate Portfolio Segment [Member]
Balance	7,033	5,382	7,295	5,060
Provision for losses	(713)	878	(1,625)	1,913
Recoveries	0	0	650	17
Charge-offs		0	0	(730)
Balance	6,320	6,260	6,320	6,260
Specific reserves	152		152		95
General reserves	6,168		6,168		7,200
Balance	6,320	6,260	6,320	6,260	7,295
Individually reviewed for impairment	684		684		1,484
Collectively reviewed for impairment	375,016		375,016		379,220
Ending balance	375,700		375,700		380,704
Consumer Portfolio Segment [Member]
Balance	1,039	1,464	1,389	1,507
Provision for losses	(72)	(64)	(408)	(79)
Recoveries	30	5	58	22
Charge-offs		(29)	(42)	(74)
Balance	997	1,376	997	1,376
Specific reserves	88		88		100
General reserves	909		909		1,289
Balance	997	1,376	997	1,376	1,389
Individually reviewed for impairment	724		724		750
Collectively reviewed for impairment	42,029		42,029		54,641
Ending balance	42,753		42,753		55,391
Commercial Portfolio Segment [Member]
Balance	914	865	985	1,140
Provision for losses	(114)	(71)	(232)	(394)
Recoveries	11	145	58	193
Charge-offs		(8)	0	(8)
Balance	811	931	811	931
Specific reserves	8		8		14
General reserves	803		803		971
Balance	811	$ 931	811	$ 931	985
Individually reviewed for impairment	18		18		35
Collectively reviewed for impairment	55,725		55,725		82,638
Ending balance	$ 55,743		$ 55,743		$ 82,673