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Note 4 - Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Beginning balance	$ 5,710	$ 7,485	$ 7,485
Charge-offs	(106)	(66)	(1,447)
Recoveries	224	67	322
Provision for (recovery of) loan losses	0	0	(650)
Ending balance	5,828	7,486	5,710
Individually evaluated for impairment, allowance	0	2,188	55
Collectively evaluated for impairment, allowance	5,828	5,298	5,655
Loans	836,423	638,202	825,118
Individually evaluated for impairment, loans	2,130	6,814	2,304
Collectively evaluated for impairment, loans	834,293	631,388	822,814
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning balance	345	306	306
Charge-offs	0	0	0
Recoveries	4	0	6
Provision for (recovery of) loan losses	(1)	(16)	33
Ending balance	348	290	345
Individually evaluated for impairment, allowance	0	0	0
Collectively evaluated for impairment, allowance	348	290	345
Loans	49,308	25,720	55,721
Individually evaluated for impairment, loans	0	269	0
Collectively evaluated for impairment, loans	49,308	25,451	55,721
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	1,077	1,022	1,022
Charge-offs	0	0	(15)
Recoveries	5	2	65
Provision for (recovery of) loan losses	(113)	7	5
Ending balance	969	1,031	1,077
Individually evaluated for impairment, allowance	0	0	0
Collectively evaluated for impairment, allowance	969	1,031	1,077
Loans	290,408	236,870	291,990
Individually evaluated for impairment, loans	619	430	765
Collectively evaluated for impairment, loans	289,789	236,440	291,225
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning balance	3,230	4,956	4,956
Charge-offs	0	0	(992)
Recoveries	2	1	3
Provision for (recovery of) loan losses	145	39	(737)
Ending balance	3,377	4,996	3,230
Individually evaluated for impairment, allowance	0	2,065	0
Collectively evaluated for impairment, allowance	3,377	2,931	3,230
Loans	384,191	248,864	364,921
Individually evaluated for impairment, loans	28	4,567	30
Collectively evaluated for impairment, loans	384,163	244,297	364,891
Commercial and Industrial Loans [Member]
Beginning balance	718	784	784
Charge-offs	(8)	0	(6)
Recoveries	140	2	7
Provision for (recovery of) loan losses	(40)	46	(67)
Ending balance	810	832	718
Individually evaluated for impairment, allowance	0	123	55
Collectively evaluated for impairment, allowance	810	709	663
Loans	103,682	117,545	99,805
Individually evaluated for impairment, loans	1,483	1,548	1,509
Collectively evaluated for impairment, loans	102,199	115,997	98,296
Consumer and Other Loans [Member]
Beginning balance	340	417	417
Charge-offs	(98)	(66)	(434)
Recoveries	73	62	241
Provision for (recovery of) loan losses	9	(76)	116
Ending balance	324	337	340
Individually evaluated for impairment, allowance	0	0	0
Collectively evaluated for impairment, allowance	324	337	340
Loans	8,834	9,203	12,681
Individually evaluated for impairment, loans	0	0	0
Collectively evaluated for impairment, loans	$ 8,834	$ 9,203	$ 12,681

X

- Definition

Amount of direct write-downs of accounts receivable charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (d)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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X

- Definition

Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

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

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X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

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

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- Definition

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+ References

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

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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 https://asc.fasb.org/extlink&oid=122038336&loc=d3e74567-122707

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-Topic 310
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=121614798&loc=d3e15032-111544

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-URI https://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
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-Topic 310
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-Paragraph 2
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X

- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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