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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, 2019	Sep. 30, 2018	Dec. 31, 2018
Beginning balance	$ 5,009	$ 5,326	$ 5,326
Charge-offs	(603)	(795)	(1,169)
Recoveries	306	170	252
Provision for (recovery of) loan losses	200	100	600
Ending balance	4,912	4,801	5,009
Individually evaluated for impairment, allowance	74	107	243
Collectively evaluated for impairment, allowance	4,838	4,694	4,766
Loans	571,253	539,821	542,856
Individually evaluated for impairment, loans	1,566	3,007	3,436
Collectively evaluated for impairment, loans	569,687	536,814	539,420
Real Estate 1 [Member] | Construction and Land Development [Member]
Beginning balance	561	414	414
Charge-offs
Recoveries	50
Provision for (recovery of) loan losses	(119)	128	147
Ending balance	492	542	561
Individually evaluated for impairment, allowance	31	87	71
Collectively evaluated for impairment, allowance	461	455	490
Loans	45,193	42,982	45,867
Individually evaluated for impairment, loans	376	343	327
Collectively evaluated for impairment, loans	44,817	42,639	45,540
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Beginning balance	895	775	775
Charge-offs	(58)	(56)	(55)
Recoveries	8	11	13
Provision for (recovery of) loan losses	(71)	(5)	162
Ending balance	774	725	895
Individually evaluated for impairment, allowance	16	20	172
Collectively evaluated for impairment, allowance	758	705	723
Loans	226,828	211,938	215,945
Individually evaluated for impairment, loans	690	438	663
Collectively evaluated for impairment, loans	226,138	211,500	215,282
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Beginning balance	2,160	2,948	2,948
Charge-offs
Recoveries		1	5
Provision for (recovery of) loan losses	166	(677)	(793)
Ending balance	2,326	2,272	2,160
Individually evaluated for impairment, allowance	27
Collectively evaluated for impairment, allowance	2,299	2,272	2,160
Loans	233,067	224,903	219,553
Individually evaluated for impairment, loans	500	2,029	2,249
Collectively evaluated for impairment, loans	232,567	222,874	217,304
Commercial and Industrial Loans [Member]
Beginning balance	464	418	418
Charge-offs	(2)	(8)	(10)
Recoveries	6	6	8
Provision for (recovery of) loan losses	98	26	48
Ending balance	566	442	464
Individually evaluated for impairment, allowance
Collectively evaluated for impairment, allowance	566	442	464
Loans	50,557	42,861	44,605
Individually evaluated for impairment, loans		197	197
Collectively evaluated for impairment, loans	50,557	42,664	44,408
Consumer and Other Loans [Member]
Beginning balance	929	771	771
Charge-offs	(543)	(731)	(1,104)
Recoveries	242	152	226
Provision for (recovery of) loan losses	126	628	1,036
Ending balance	754	820	929
Individually evaluated for impairment, allowance
Collectively evaluated for impairment, allowance	754	820	929
Loans	15,608	17,137	16,886
Individually evaluated for impairment, loans
Collectively evaluated for impairment, loans	$ 15,608	$ 17,137	$ 16,886

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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Balance Type:	debit
Period Type:	duration

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=119407570&loc=SL82919249-210447

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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
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=118936363&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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=118936363&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

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-Paragraph 11B
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- Definition

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

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-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524

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- Definition

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
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-URI http://asc.fasb.org/extlink&oid=118936363&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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
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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

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