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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Balance	$ 15,067	$ 12,242	$ 12,231	$ 12,292
Charge-offs	(356)	(659)	(525)	(1,007)
Recoveries	78	862	233	1,160
Provision for loan and lease losses	1,300	0	4,150	0
Balance	16,089	12,445	16,089	12,445
Individually evaluated for impairment					$ 270	$ 324
Collectively evaluated for impairment					15,819	11,907
Total	16,089	12,445	12,231	12,292	16,089	12,231
Individually evaluated for impairment					11,126	10,399
Collectively evaluated for impairment					1,195,214	1,022,504
Total gross loans					1,206,340	1,032,903
SBA CARES Act Paycheck Protection Program [Member]
Balance	0	0	0	0
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	0	0	0	0
Balance	0	0	0	0
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					0	0
Total	0	0	0	0	0	0
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					162,189	0
Total gross loans					162,189	0
Commercial Portfolio Segment [Member]
Balance	2,483	2,479	1,822	2,205
Charge-offs	0	(145)	0	(145)
Recoveries	14	757	22	911
Provision for loan and lease losses	(97)	(987)	556	(867)
Balance	2,400	2,104	2,400	2,104
Individually evaluated for impairment					137	159
Collectively evaluated for impairment					2,263	1,663
Total	2,400	2,104	1,822	2,205	2,400	1,822
Individually evaluated for impairment					599	656
Collectively evaluated for impairment					125,425	140,541
Total gross loans					126,024	141,197
Commercial Real Estate Portfolio Segment [Member]
Balance	9,899	6,956	8,096	7,116
Charge-offs	(145)	(233)	(145)	(233)
Recoveries	0	0	0	0
Provision for loan and lease losses	1,182	875	2,985	715
Balance	10,936	7,598	10,936	7,598
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					10,936	8,096
Total	10,936	7,598	8,096	7,116	10,936	8,096
Individually evaluated for impairment					4,709	3,103
Collectively evaluated for impairment					773,465	736,480
Total gross loans					778,174	739,583
Residential Portfolio Segment [Member]
Balance	1,281	1,211	1,032	1,173
Charge-offs	(29)	(71)	(35)	(139)
Recoveries	18	18	62	100
Provision for loan and lease losses	36	(88)	247	(64)
Balance	1,306	1,070	1,306	1,070
Individually evaluated for impairment					123	154
Collectively evaluated for impairment					1,183	878
Total	1,306	1,070	1,032	1,173	1,306	1,032
Individually evaluated for impairment					5,781	6,600
Collectively evaluated for impairment					106,996	112,199
Total gross loans					112,777	118,799
Consumer Portfolio Segment [Member]
Balance	972	1,056	933	1,356
Charge-offs	(182)	(210)	(345)	(490)
Recoveries	46	87	149	149
Provision for loan and lease losses	34	137	133	55
Balance	870	1,070	870	1,070
Individually evaluated for impairment					10	11
Collectively evaluated for impairment					860	922
Total	870	1,070	933	1,356	870	933
Individually evaluated for impairment					37	40
Collectively evaluated for impairment					27,139	33,284
Total gross loans					27,176	33,324
Unallocated Financing Receivables [Member]
Balance	432	540	348	442
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	145	63	229	161
Balance	577	603	577	603
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					577	348
Total	$ 577	$ 603	$ 348	$ 442	577	348
Individually evaluated for impairment					0	0
Collectively evaluated for impairment					0	0
Total gross loans					$ 0	$ 0