Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Dec. 31, 2019
Balance	$ 10,115	$ 7,609
Charge-offs	(44)
Recoveries	41	49
Provisions (credits)	804	165
Balance	10,916	7,823
Individually evaluated for impairment			$ 1,716
Collectively evaluated for impairment			9,200
Total allowance for loan and lease losses	10,916	7,823	10,916	$ 10,115
Individually evaluated for impairment			18,025
PCI loans individually evaluated for impairment			38
Collectively evaluated for impairment			800,778
Balance			818,841
Total allowance for loan losses	10,916	7,823	10,916	10,115
Loans receivable, gross: Individually evaluated for impairment			18,025
PCI loans individually evaluated for impairment			38
Loans receivable, gross: Collectively evaluated for impairment			800,778
Total loans receivable, gross			818,841
Business Activities Loans [Member]
Balance	10,115
Balance	10,916
Individually evaluated for impairment				1,496
Collectively evaluated for impairment				8,619
Total allowance for loan and lease losses	10,115		10,916	10,115
Individually evaluated for impairment				19,628
PCI loans individually evaluated for impairment				176
Collectively evaluated for impairment				792,360
Balance			818,841	812,164	[1]
Total allowance for loan losses	10,115		10,916	10,115
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			818,841	812,164	[1]
Commercial Real Estate Portfolio Segment [Member]
Balance	3,789	1,866
Charge-offs	0	0
Recoveries
Provisions (credits)	361	(4)
Balance	4,150	1,862
Individually evaluated for impairment			1,703
Collectively evaluated for impairment			2,447
Total allowance for loan and lease losses	4,150	1,862	4,150	3,789
Individually evaluated for impairment			11,518
PCI loans individually evaluated for impairment
Collectively evaluated for impairment			292,974
Balance			304,492
Total allowance for loan losses	4,150	1,862	4,150	3,789
Loans receivable, gross: Individually evaluated for impairment			11,518
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment			292,974
Total loans receivable, gross			304,492
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	3,789
Individually evaluated for impairment				1,496
Collectively evaluated for impairment				2,293
Total allowance for loan and lease losses	3,789			3,789
Individually evaluated for impairment				13,034
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				301,380
Balance			304,492	314,414
Total allowance for loan losses	3,789			3,789
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			304,492	314,414
Residential Portfolio Segment [Member]
Balance	1,038	1,059
Charge-offs	(1)
Recoveries
Provisions (credits)	83	330
Balance	1,120	1,389
Individually evaluated for impairment			4
Collectively evaluated for impairment			1,116
Total allowance for loan and lease losses	1,120	1,389	1,120	1,038
Individually evaluated for impairment			3,589
PCI loans individually evaluated for impairment
Collectively evaluated for impairment			168,206
Balance			171,795
Total allowance for loan losses	1,120	1,389	1,120	1,038
Loans receivable, gross: Individually evaluated for impairment			3,589
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment			168,206
Total loans receivable, gross			171,795
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	1,038
Individually evaluated for impairment
Collectively evaluated for impairment				1,038
Total allowance for loan and lease losses	1,038			1,038
Individually evaluated for impairment				3,621
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				171,868
Balance			171,795	175,489
Total allowance for loan losses	1,038			1,038
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			171,795	175,489
Commercial Portfolio Segment [Member]
Balance	4,340	3,558
Charge-offs	(4)
Recoveries	40	47
Provisions (credits)	14	(115)
Balance	4,390	3,490
Individually evaluated for impairment
Collectively evaluated for impairment			4,390
Total allowance for loan and lease losses	4,390	3,490	4,390	4,340
Individually evaluated for impairment			2,048
PCI loans individually evaluated for impairment			38
Collectively evaluated for impairment			177,371
Balance			179,457
Total allowance for loan losses	4,390	3,490	4,390	4,340
Loans receivable, gross: Individually evaluated for impairment			2,048
PCI loans individually evaluated for impairment			38
Loans receivable, gross: Collectively evaluated for impairment			177,371
Total loans receivable, gross			179,457
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	4,340
Individually evaluated for impairment
Collectively evaluated for impairment				4,340
Total allowance for loan and lease losses	4,340			4,340
Individually evaluated for impairment				2,057
PCI loans individually evaluated for impairment				176
Collectively evaluated for impairment				171,642
Balance			179,457	173,875
Total allowance for loan losses	4,340			4,340
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			179,457	173,875
Consumer Portfolio Segment [Member]
Balance	341	641
Charge-offs	(39)
Recoveries	1	2
Provisions (credits)	231	(51)
Balance	534	592
Individually evaluated for impairment			9
Collectively evaluated for impairment			525
Total allowance for loan and lease losses	534	592	534	341
Individually evaluated for impairment			870
PCI loans individually evaluated for impairment
Collectively evaluated for impairment			95,750
Balance			96,620
Total allowance for loan losses	534	592	534	341
Loans receivable, gross: Individually evaluated for impairment			870
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment			95,750
Total loans receivable, gross			96,620
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	341
Individually evaluated for impairment
Collectively evaluated for impairment				341
Total allowance for loan and lease losses	341			341
Individually evaluated for impairment				916
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				85,018
Balance			96,620	85,934
Total allowance for loan losses	341			341
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			96,620	85,934
Construction Portfolio Segment [Member]
Balance	477	350
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	126	5
Balance	603	355
Individually evaluated for impairment
Collectively evaluated for impairment			603
Total allowance for loan and lease losses	603	355	603	477
Individually evaluated for impairment			0
PCI loans individually evaluated for impairment			0
Collectively evaluated for impairment			55,255
Balance			55,255
Total allowance for loan losses	603	355	603	477
Loans receivable, gross: Individually evaluated for impairment			0
PCI loans individually evaluated for impairment			0
Loans receivable, gross: Collectively evaluated for impairment			55,255
Total loans receivable, gross			55,255
Construction Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	477
Individually evaluated for impairment				0
Collectively evaluated for impairment				477
Total allowance for loan and lease losses	477			477
Individually evaluated for impairment
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				48,388
Balance			55,255	48,388
Total allowance for loan losses	477			477
Loans receivable, gross: Individually evaluated for impairment
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				48,388
Total loans receivable, gross			55,255	48,388
Construction to Permanent Portfolio Segment [Member]
Balance	130	108
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)	(11)	15
Balance	119	123
Individually evaluated for impairment
Collectively evaluated for impairment			119
Total allowance for loan and lease losses	119	123	119	130
Individually evaluated for impairment			0
PCI loans individually evaluated for impairment			0
Collectively evaluated for impairment			11,222
Balance			11,222
Total allowance for loan losses	119	123	119	130
Loans receivable, gross: Individually evaluated for impairment			0
PCI loans individually evaluated for impairment			0
Loans receivable, gross: Collectively evaluated for impairment			11,222
Total loans receivable, gross			11,222
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]
Balance	130
Individually evaluated for impairment				0
Collectively evaluated for impairment				130
Total allowance for loan and lease losses	130			130
Individually evaluated for impairment				0
PCI loans individually evaluated for impairment
Collectively evaluated for impairment				14,064
Balance			11,222	14,064
Total allowance for loan losses	130			130
Loans receivable, gross: Individually evaluated for impairment				0
PCI loans individually evaluated for impairment
Loans receivable, gross: Collectively evaluated for impairment				14,064
Total loans receivable, gross			11,222	14,064
Unallocated Financing Receivables [Member]
Balance		27
Charge-offs	0	0
Recoveries	0	0
Provisions (credits)		(15)
Balance		12
Individually evaluated for impairment
Collectively evaluated for impairment			0
Total allowance for loan and lease losses		12
Individually evaluated for impairment			0
PCI loans individually evaluated for impairment			0
Collectively evaluated for impairment
Balance
Total allowance for loan losses		$ 12
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
Individually evaluated for impairment				0
Collectively evaluated for impairment
Total allowance for loan and lease losses
Individually evaluated for impairment				0
PCI loans individually evaluated for impairment
Collectively evaluated for impairment
Balance
Total allowance for loan losses
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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