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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Allowance for loan and lease losses	$ (11,171)	$ (11,148)	$ (10,115)	$ (8,405)	$ (8,458)	$ (7,609)
Loans receivable, net	740,127		802,049
Business Activities Loans [Member]
Loans receivable, gross	751,298		812,164
Allowance for loan and lease losses	(11,171)		(10,115)
Loans receivable, net	740,127
Acquired Loans [Member]
Loans receivable, gross			812,164
Allowance for loan and lease losses			(10,115)
Loans receivable, net			802,049
Commercial Real Estate Portfolio Segment [Member]
Allowance for loan and lease losses	(4,397)	(4,274)	(3,789)	(2,089)	(1,978)	(1,866)
Commercial Real Estate Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	292,067		314,414
Allowance for loan and lease losses	(4,397)		(3,789)
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross			314,414
Residential Portfolio Segment [Member]
Allowance for loan and lease losses	(1,537)	(1,910)	(1,038)	(965)	(936)	(1,059)
Residential Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	162,976		175,489
Allowance for loan and lease losses	(1,537)		(1,038)
Residential Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross			175,489
Commercial Portfolio Segment [Member]
Allowance for loan and lease losses	(3,470)	(3,526)	(4,340)	(4,355)	(4,208)	(3,558)
Commercial Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	147,248		173,875
Allowance for loan and lease losses	(3,470)		(4,340)
Commercial Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross			173,875
Consumer Portfolio Segment [Member]
Allowance for loan and lease losses	(540)	(534)	(341)	(368)	(664)	(641)
Consumer Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	73,127		85,934
Allowance for loan and lease losses	(540)		(341)
Consumer Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross			85,934
Construction Portfolio Segment [Member]
Allowance for loan and lease losses	(818)	(666)	(477)	(448)	(467)	(350)
Construction Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	61,534		48,388
Allowance for loan and lease losses	(818)		(477)
Construction Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross			48,388
Construction to Permanent Portfolio Segment [Member]
Allowance for loan and lease losses	(189)	$ (149)	(130)	$ (115)	$ (105)	$ (108)
Construction to Permanent Portfolio Segment [Member] | Business Activities Loans [Member]
Loans receivable, gross	14,346		14,064
Allowance for loan and lease losses	$ (189)		(130)
Construction to Permanent Portfolio Segment [Member] | Acquired Loans [Member]
Loans receivable, gross			$ 14,064

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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-Topic 310
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-Section 50
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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
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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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