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Note 4 - Loans Receivable and Allowance for Loan and Lease Losses - Loan Portfolio (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Loans receivable, gross	$ 714,538		$ 730,180
Allowance for loan and lease losses	(10,079)	$ (10,362)	(10,584)	$ (11,171)	$ (11,148)	$ (10,115)
Loans receivable, net	704,459		719,596
Commercial Real Estate Portfolio Segment [Member]
Loans receivable, gross	315,853		282,378
Allowance for loan and lease losses	(4,686)	(4,079)	(4,485)	(4,397)	(4,274)	(3,789)
Residential Portfolio Segment [Member]
Loans receivable, gross	171,800		153,851
Allowance for loan and lease losses	(2,135)	(2,003)	(1,379)	(1,537)	(1,910)	(1,038)
Commercial Portfolio Segment [Member]
Loans receivable, gross	119,688		144,297
Allowance for loan and lease losses	(2,368)	(3,212)	(3,284)	(3,470)	(3,526)	(4,340)
Consumer Portfolio Segment [Member]
Loans receivable, gross	53,676		67,635
Allowance for loan and lease losses	(335)	(390)	(295)	(540)	(534)	(341)
Construction Portfolio Segment [Member]
Loans receivable, gross	41,609		66,984
Allowance for loan and lease losses	(231)	(369)	(739)	(818)	(666)	(477)
Construction to Permanent Portfolio Segment [Member]
Loans receivable, gross	11,912		15,035
Allowance for loan and lease losses	$ (62)	$ (144)	$ (162)	$ (189)	$ (149)	$ (130)

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.1)
-URI http://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (b)(1)(ii)
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-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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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
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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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
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
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-Section 45
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-URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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