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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2019		Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Allowance for loan and lease losses	$ (8,405)		$ (8,458)	$ (7,609)	$ (6,605)	$ (6,525)	$ (6,297)
Loans receivable, net	791,909			772,767
Business Activities Loans [Member]
Loans receivable, gross	800,314	[1]		780,376
Allowance for loan and lease losses	(8,405)			(7,609)
Loans receivable, net	791,909
Acquired Loans [Member]
Loans receivable, gross				780,376
Allowance for loan and lease losses				(7,609)
Loans receivable, net				772,767
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan and lease losses	(2,089)		(1,978)	(1,866)	(1,763)	(2,305)	(2,212)
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	299,605			274,938
Allowance for loan and lease losses	(2,089)			(1,866)
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross				274,938
Residential Portfolio Segment [Member]
Allowance for loan and lease losses	(965)		(936)	(1,059)	(865)	(1,096)	(959)
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	163,546			157,300
Allowance for loan and lease losses	(965)			(1,059)
Residential Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross				157,300
Commercial Portfolio Segment [Member]
Allowance for loan and lease losses	(4,355)		(4,208)	(3,558)	(2,241)	(1,996)	(2,023)
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	186,795			191,852
Allowance for loan and lease losses	(4,355)			(3,558)
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross				191,852
Consumer Portfolio Segment [Member]
Allowance for loan and lease losses	(368)		(664)	(641)	(670)	(523)	(568)
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	93,467			94,569
Allowance for loan and lease losses	(368)			(641)
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross				94,569
Construction Portfolio Segment [Member]
Allowance for loan and lease losses	(448)		(467)	(350)	(680)	(499)	(481)
Construction Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	44,349			46,040
Allowance for loan and lease losses	(448)			(350)
Construction Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross				46,040
Construction to Permanent Portfolio Segment [Member]
Allowance for loan and lease losses	(115)		$ (105)	(108)	$ (100)	$ (80)	$ (54)
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	12,552			15,677
Allowance for loan and lease losses	$ (115)			(108)
Construction to Permanent Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross				$ 15,677
[1]

X

- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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X

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
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-Section 45
-Paragraph 2
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X

- Definition

Amount, after allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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