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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, 2020		Sep. 30, 2019	Dec. 31, 2019
Beginning balance	$ 4,934	[1]	$ 5,009	$ 5,009
Charge-offs	(619)		(603)	(884)
Recoveries	262		306	359
Provision for (recovery of) loan losses	3,200		200	450
Ending balance	7,777		4,912	4,934	[1]
Individually evaluated for impairment, allowance	2,289		74	33
Collectively evaluated for impairment, allowance	5,488		4,838	4,901
Loans	648,368			574,346
Individually evaluated for impairment, loans	6,974		1,566	1,459
Collectively evaluated for impairment, loans	641,394		569,687	572,887
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning balance	464		561	561
Charge-offs	0		0	(2)
Recoveries	2		50	50
Provision for (recovery of) loan losses	(164)		(119)	(145)
Ending balance	302		492	464
Individually evaluated for impairment, allowance	0		31	22
Collectively evaluated for impairment, allowance	302		461	442
Loans	27,472			43,164
Individually evaluated for impairment, loans	283		376	367
Collectively evaluated for impairment, loans	27,189		44,817	42,797
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	776		895	895
Charge-offs	0		(58)	(58)
Recoveries	6		8	9
Provision for (recovery of) loan losses	305		(71)	(70)
Ending balance	1,087		774	776
Individually evaluated for impairment, allowance	0		16	11
Collectively evaluated for impairment, allowance	1,087		758	765
Loans	234,198			229,438
Individually evaluated for impairment, loans	469		690	630
Collectively evaluated for impairment, loans	233,729		226,138	228,808
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning balance	2,296		2,160	2,160
Charge-offs	0		0	(27)
Recoveries	2		0	1
Provision for (recovery of) loan losses	2,691		166	162
Ending balance	4,989		2,326	2,296
Individually evaluated for impairment, allowance	2,108		27	0
Collectively evaluated for impairment, allowance	2,881		2,299	2,296
Loans	250,319			236,555
Individually evaluated for impairment, loans	4,674		500	462
Collectively evaluated for impairment, loans	245,645		232,567	236,093
Commercial and Industrial Loans [Member]
Beginning balance	562		464	464
Charge-offs	(69)		(2)	(2)
Recoveries	17		6	8
Provision for (recovery of) loan losses	398		98	92
Ending balance	908		566	562
Individually evaluated for impairment, allowance	181		0	0
Collectively evaluated for impairment, allowance	727		566	562
Loans	125,277			50,153
Individually evaluated for impairment, loans	1,548		0	0
Collectively evaluated for impairment, loans	123,729		50,557	50,153
Consumer and Other Loans [Member]
Beginning balance	836		929	929
Charge-offs	(550)		(543)	(795)
Recoveries	235		242	291
Provision for (recovery of) loan losses	(30)		126	411
Ending balance	491		754	836
Individually evaluated for impairment, allowance	0		0	0
Collectively evaluated for impairment, allowance	491		754	836
Loans	11,102			15,036
Individually evaluated for impairment, loans	0		0	0
Collectively evaluated for impairment, loans	$ 11,102		$ 15,608	$ 15,036
[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

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)
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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

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-Paragraph 11B
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- Definition

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

+ References

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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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