Note 4 - Loan Receivable and Allowance for Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Balance	$ 7,609	$ 6,297	$ 4,675
Charge-offs	(2,659)	(35)	(304)
Recoveries	194	44	2,783
Provisions (credits)	4,971	1,303	(857)
Balance	10,115	7,609	6,297
Individually evaluated for impairment				$ 1,496
Collectively evaluated for impairment				8,619
Total allowance for loan and lease losses	10,115	6,297	4,675	10,115	$ 7,609
Individually evaluated for impairment				19,628
PCI loans individually evaluated for impairment				176
Collectively evaluated for impairment				792,360
Balance				812,164
Total allowance for loan losses	10,115	6,297	4,675	10,115	7,609
Loans receivable, gross: Individually evaluated for impairment				19,628
PCI loans individually evaluated for impairment				176
Loans receivable, gross: Collectively evaluated for impairment				792,360
Total loans receivable, gross				812,164
Business Activities Loans [Member]
Balance	7,609
Balance	10,115	7,609
Individually evaluated for impairment					1,545
Collectively evaluated for impairment					6,064
Total allowance for loan and lease losses	7,609	7,609		10,115	7,609
Individually evaluated for impairment					21,218
PCI loans individually evaluated for impairment					615
Collectively evaluated for impairment					758,543
Balance				812,164	780,376	[1]
Total allowance for loan losses	7,609	7,609		10,115	7,609
Loans receivable, gross: Individually evaluated for impairment					21,218
PCI loans individually evaluated for impairment					615
Loans receivable, gross: Collectively evaluated for impairment					758,543
Total loans receivable, gross				812,164	780,376	[1]
Commercial Real Estate Portfolio Segment [Member]
Balance	1,866	2,212	1,853
Charge-offs	0	0
Recoveries	2	7	10
Provisions (credits)	1,921	(353)	349
Balance	3,789	1,866	2,212
Individually evaluated for impairment				1,496
Collectively evaluated for impairment				2,293
Total allowance for loan and lease losses	3,789	2,212	1,853	3,789	1,866
Individually evaluated for impairment				13,034
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				301,380
Balance				314,414
Total allowance for loan losses	3,789	2,212	1,853	3,789	1,866
Loans receivable, gross: Individually evaluated for impairment				13,034
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				301,380
Total loans receivable, gross				314,414
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	1,866
Balance		1,866
Individually evaluated for impairment					0
Collectively evaluated for impairment					1,866
Total allowance for loan and lease losses	1,866	1,866			1,866
Individually evaluated for impairment					4,606
PCI loans individually evaluated for impairment
Collectively evaluated for impairment					270,332
Balance				314,414	274,938
Total allowance for loan losses	1,866	1,866			1,866
Loans receivable, gross: Individually evaluated for impairment					4,606
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment					270,332
Total loans receivable, gross				314,414	274,938
Residential Portfolio Segment [Member]
Balance	1,059	959	534
Charge-offs	(118)	(2)
Recoveries	10	2
Provisions (credits)	87	100	425
Balance	1,038	1,059	959
Individually evaluated for impairment
Collectively evaluated for impairment				1,038
Total allowance for loan and lease losses	1,038	959	534	1,038	1,059
Individually evaluated for impairment				3,621
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				171,868
Balance				175,489
Total allowance for loan losses	1,038	959	534	1,038	1,059
Loans receivable, gross: Individually evaluated for impairment				3,621
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				171,868
Total loans receivable, gross				175,489
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	1,059
Balance		1,059
Individually evaluated for impairment					216
Collectively evaluated for impairment					843
Total allowance for loan and lease losses	1,059	1,059			1,059
Individually evaluated for impairment					2,302
PCI loans individually evaluated for impairment
Collectively evaluated for impairment					154,998
Balance				175,489	157,300
Total allowance for loan losses	1,059	1,059			1,059
Loans receivable, gross: Individually evaluated for impairment					2,302
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment					154,998
Total loans receivable, gross				175,489	157,300
Commercial Portfolio Segment [Member]
Balance	3,558	2,023	740
Charge-offs	(2,418)		(265)
Recoveries	172	34	2,769
Provisions (credits)	3,028	1,501	(1,221)
Balance	4,340	3,558	2,023
Individually evaluated for impairment
Collectively evaluated for impairment				4,340
Total allowance for loan and lease losses	4,340	2,023	740	4,340	3,558
Individually evaluated for impairment				2,057
PCI loans individually evaluated for impairment				176
Collectively evaluated for impairment				171,642
Balance				173,875
Total allowance for loan losses	4,340	2,023	740	4,340	3,558
Loans receivable, gross: Individually evaluated for impairment				2,057
PCI loans individually evaluated for impairment				176
Loans receivable, gross: Collectively evaluated for impairment				171,642
Total loans receivable, gross				173,875
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	3,558
Balance		3,558
Individually evaluated for impairment					1,299
Collectively evaluated for impairment					2,259
Total allowance for loan and lease losses	3,558	3,558			3,558
Individually evaluated for impairment					4,646
PCI loans individually evaluated for impairment					615
Collectively evaluated for impairment					186,591
Balance				173,875	191,852
Total allowance for loan losses	3,558	3,558			3,558
Loans receivable, gross: Individually evaluated for impairment					4,646
PCI loans individually evaluated for impairment					615
Loans receivable, gross: Collectively evaluated for impairment					186,591
Total loans receivable, gross				173,875	191,852
Consumer Portfolio Segment [Member]
Balance	641	568	641
Charge-offs	(123)	(33)	(39)
Recoveries	10	1	4
Provisions (credits)	(187)	105	(38)
Balance	341	641	568
Individually evaluated for impairment
Collectively evaluated for impairment				341
Total allowance for loan and lease losses	341	568	641	341	641
Individually evaluated for impairment				916
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				85,018
Balance				85,934
Total allowance for loan losses	341	568	641	341	641
Loans receivable, gross: Individually evaluated for impairment				916
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				85,018
Total loans receivable, gross				85,934
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	641
Balance		641
Individually evaluated for impairment					30
Collectively evaluated for impairment					611
Total allowance for loan and lease losses	641	641			641
Individually evaluated for impairment					864
PCI loans individually evaluated for impairment
Collectively evaluated for impairment					93,705
Balance				85,934	94,569
Total allowance for loan losses	641	641			641
Loans receivable, gross: Individually evaluated for impairment					864
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment					93,705
Total loans receivable, gross				85,934	94,569
Construction Portfolio Segment [Member]
Balance	350	481	712
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	127	(131)	(231)
Balance	477	350	481
Individually evaluated for impairment
Collectively evaluated for impairment				477
Total allowance for loan and lease losses	477	481	712	477	350
Individually evaluated for impairment				0
PCI loans individually evaluated for impairment				0
Collectively evaluated for impairment				48,388
Balance				48,388
Total allowance for loan losses	477	481	712	477	350
Loans receivable, gross: Individually evaluated for impairment				0
PCI loans individually evaluated for impairment				0
Loans receivable, gross: Collectively evaluated for impairment				48,388
Total loans receivable, gross				48,388
Construction Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	350
Balance		350
Individually evaluated for impairment					0
Collectively evaluated for impairment					350
Total allowance for loan and lease losses	350	350			350
Individually evaluated for impairment					8,800
PCI loans individually evaluated for impairment
Collectively evaluated for impairment					37,240
Balance				48,388	46,040
Total allowance for loan losses	350	350			350
Loans receivable, gross: Individually evaluated for impairment					8,800
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment					37,240
Total loans receivable, gross				48,388	46,040
Construction to Permanent Portfolio Segment [Member]
Balance	108	54	69
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	22	54	(15)
Balance	130	108	54
Individually evaluated for impairment
Collectively evaluated for impairment				130
Total allowance for loan and lease losses	130	54	69	130	108
Individually evaluated for impairment				0
PCI loans individually evaluated for impairment				0
Collectively evaluated for impairment				14,064
Balance				14,064
Total allowance for loan losses	130	54	69	130	108
Loans receivable, gross: Individually evaluated for impairment				0
PCI loans individually evaluated for impairment				0
Loans receivable, gross: Collectively evaluated for impairment				14,064
Total loans receivable, gross				14,064
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	108
Balance		108
Individually evaluated for impairment					0
Collectively evaluated for impairment					108
Total allowance for loan and lease losses	108	108			108
Individually evaluated for impairment					0
PCI loans individually evaluated for impairment
Collectively evaluated for impairment					15,677
Balance				14,064	15,677
Total allowance for loan losses	108	108			108
Loans receivable, gross: Individually evaluated for impairment					0
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment					15,677
Total loans receivable, gross				14,064	15,677
Unallocated Financing Receivables [Member]
Balance	27		126
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	(27)	27	(126)
Balance		27
Individually evaluated for impairment
Collectively evaluated for impairment				0
Total allowance for loan and lease losses			126		27
Individually evaluated for impairment				0
PCI loans individually evaluated for impairment				0
Collectively evaluated for impairment
Balance
Total allowance for loan losses			$ 126		27
Loans receivable, gross: Individually evaluated for impairment				0
PCI loans individually evaluated for impairment				0
Loans receivable, gross: Collectively evaluated for impairment
Total loans receivable, gross
Unallocated Financing Receivables [Member] | Business Activities Loans [Member]
Balance	27
Balance		27
Individually evaluated for impairment					0
Collectively evaluated for impairment					27
Total allowance for loan and lease losses	27	27			27
Individually evaluated for impairment					0
PCI loans individually evaluated for impairment
Collectively evaluated for impairment
Balance
Total allowance for loan losses	$ 27	$ 27			27
Loans receivable, gross: Individually evaluated for impairment					0
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment
Total loans receivable, gross

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