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Note 4 - Allowance for Loan Losses - Allowance by Impairment Methodology and Loans by Impairment Methodology (Details) - USD ($) $ in Thousands	9 Months Ended			12 Months Ended
	Sep. 30, 2021		Sep. 30, 2020	Dec. 31, 2020
Beginning balance	$ 7,485	[1]	$ 4,934	$ 4,934
Charge-offs	(1,262)		(619)	(784)
Recoveries	211		262	335
(Recovery of) provision for loan losses	(1,000)		3,200	3,000
Ending balance	5,434		7,777	7,485	[1]
Individually evaluated for impairment, allowance	84		2,289	2,223
Collectively evaluated for impairment, allowance	5,350		5,488	5,262
Loans	822,411		648,368	629,914
Individually evaluated for impairment, loans	2,158		6,974	6,714
Collectively evaluated for impairment, loans	820,253		641,394	623,200
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning balance	306		464	464
Charge-offs	0		0	0
Recoveries	0		2	2
(Recovery of) provision for loan losses	(25)		(164)	(160)
Ending balance	281		302	306
Individually evaluated for impairment, allowance	0		0	0
Collectively evaluated for impairment, allowance	281		302	306
Loans	45,120		27,472	27,328
Individually evaluated for impairment, loans	0		283	276
Collectively evaluated for impairment, loans	45,120		27,189	27,052
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	1,022		776	776
Charge-offs	(15)		0	0
Recoveries	46		6	8
(Recovery of) provision for loan losses	(97)		305	238
Ending balance	956		1,087	1,022
Individually evaluated for impairment, allowance	0		0	0
Collectively evaluated for impairment, allowance	956		1,087	1,022
Loans	294,216		234,198	235,814
Individually evaluated for impairment, loans	470		469	449
Collectively evaluated for impairment, loans	293,746		233,729	235,365
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning balance	4,956		2,296	2,296
Charge-offs	(992)		0	0
Recoveries	2		2	2
(Recovery of) provision for loan losses	(813)		2,691	2,658
Ending balance	3,153		4,989	4,956
Individually evaluated for impairment, allowance	0		2,108	2,065
Collectively evaluated for impairment, allowance	3,153		2,881	2,891
Loans	362,643		250,319	246,883
Individually evaluated for impairment, loans	153		4,674	4,441
Collectively evaluated for impairment, loans	362,490		245,645	242,442
Commercial and Industrial Loans [Member]
Beginning balance	784		562	562
Charge-offs	0		(69)	(69)
Recoveries	6		17	18
(Recovery of) provision for loan losses	(81)		398	273
Ending balance	709		908	784
Individually evaluated for impairment, allowance	84		181	158
Collectively evaluated for impairment, allowance	625		727	626
Loans	105,664		125,277	109,838
Individually evaluated for impairment, loans	1,535		1,548	1,548
Collectively evaluated for impairment, loans	104,129		123,729	108,290
Consumer and Other Loans [Member]
Beginning balance	417		836	836
Charge-offs	(255)		(550)	(715)
Recoveries	157		235	305
(Recovery of) provision for loan losses	16		(30)	(9)
Ending balance	335		491	417
Individually evaluated for impairment, allowance	0		0	0
Collectively evaluated for impairment, allowance	335		491	417
Loans	14,768		11,102	10,051
Individually evaluated for impairment, loans	0		0	0
Collectively evaluated for impairment, loans	$ 14,768		$ 11,102	$ 10,051
[1] Derived from audited consolidated financial statements.

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)
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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
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X

- Definition

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

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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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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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- 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.

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

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