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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, 2021		Mar. 31, 2020	Dec. 31, 2020
Beginning balance	$ 7,485	[1]	$ 4,934	$ 4,934
Charge-offs	(66)		(328)	(784)
Recoveries	67		78	335
Provision for (recovery of) loan losses			900	3,000
Ending balance	7,486		5,584	7,485	[1]
Individually evaluated for impairment, allowance	2,188		11	2,223
Collectively evaluated for impairment, allowance	5,298		5,573	5,262
Loans	638,202		581,867	629,914
Individually evaluated for impairment, loans	6,814		1,522	6,714
Collectively evaluated for impairment, loans	631,388		580,345	623,200
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning balance	306		464	464
Charge-offs
Recoveries				2
Provision for (recovery of) loan losses	(16)		(3)	(160)
Ending balance	290		461	306
Individually evaluated for impairment, allowance
Collectively evaluated for impairment, allowance	290		461	306
Loans	25,720		40,279	27,328
Individually evaluated for impairment, loans	269		400	276
Collectively evaluated for impairment, loans	25,451		39,879	27,052
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	1,022		776	776
Charge-offs
Recoveries	2		2	8
Provision for (recovery of) loan losses	7		298	238
Ending balance	1,031		1,076	1,022
Individually evaluated for impairment, allowance			11
Collectively evaluated for impairment, allowance	1,031		1,065	1,022
Loans	236,870		230,980	235,814
Individually evaluated for impairment, loans	430		667	449
Collectively evaluated for impairment, loans	236,440		230,313	235,365
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning balance	4,956		2,296	2,296
Charge-offs
Recoveries	1		1	2
Provision for (recovery of) loan losses	39		347	2,658
Ending balance	4,996		2,644	4,956
Individually evaluated for impairment, allowance	2,065			2,065
Collectively evaluated for impairment, allowance	2,931		2,644	2,891
Loans	248,864		241,374	246,883
Individually evaluated for impairment, loans	4,567		455	4,441
Collectively evaluated for impairment, loans	244,297		240,919	242,442
Commercial and Industrial Loans [Member]
Beginning balance	784		562	562
Charge-offs			(68)	(69)
Recoveries	2		2	18
Provision for (recovery of) loan losses	46		215	273
Ending balance	832		711	784
Individually evaluated for impairment, allowance	123			158
Collectively evaluated for impairment, allowance	709		711	626
Loans	117,545		55,508	109,838
Individually evaluated for impairment, loans	1,548			1,548
Collectively evaluated for impairment, loans	115,997		55,508	108,290
Consumer and Other Loans [Member]
Beginning balance	417		836	836
Charge-offs	(66)		(260)	(715)
Recoveries	62		73	305
Provision for (recovery of) loan losses	(76)		43	(9)
Ending balance	337		692	417
Individually evaluated for impairment, allowance
Collectively evaluated for impairment, allowance	337		692	417
Loans	9,203		13,726	10,051
Individually evaluated for impairment, loans
Collectively evaluated for impairment, loans	$ 9,203		$ 13,726	$ 10,051
[1] Derived from audited consolidated financial statements.

X

- Definition

Represents the amount of provision (reduction in reserve) for loan losses during the period.

+ References

No definition available.

+ Details

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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 http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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- Definition

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

+ References

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- Definition

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

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- Definition

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

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- 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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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.

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