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Note 4 - Allowance for Credit Losses - Modified Financing Receivable (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Amortized cost basis		$ 101
Extended Maturity [Member]
Amortized cost basis	$ 2,528
to Total Financing Receivables, Percentage	2.12%
Principal Forgiveness [Member]
Amortized cost basis	$ 17
to Total Financing Receivables, Percentage	0.01%
Real Estate 1 [Member] | Construction and Land Development [Member] | Extended Maturity [Member]
Amortized cost basis	$ 0
to Total Financing Receivables, Percentage	0.00%
Real Estate 1 [Member] | Construction and Land Development [Member] | Principal Forgiveness [Member]
Amortized cost basis	$ 0
to Total Financing Receivables, Percentage	0.00%
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Extended Maturity [Member]
Amortized cost basis	$ 64
to Total Financing Receivables, Percentage	0.02%
term effect (Year)	15 years
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member] | Principal Forgiveness [Member]
Amortized cost basis	$ 17
to Total Financing Receivables, Percentage	0.01%
financial effect	$ 29
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Extended Maturity [Member]
Amortized cost basis	$ 0
to Total Financing Receivables, Percentage	0.00%
Real Estate 1 [Member] | Other Real Estate Loans [Member] | Principal Forgiveness [Member]
Amortized cost basis	$ 0
to Total Financing Receivables, Percentage	0.00%
Commercial and Industrial Loans [Member] | Extended Maturity [Member]
Amortized cost basis	$ 2,464
to Total Financing Receivables, Percentage	2.10%
Commercial and Industrial Loans [Member] | Principal Forgiveness [Member]
Amortized cost basis	$ 0
to Total Financing Receivables, Percentage	0.00%

X

- Definition

Percentage of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Accumulated amortized cost of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 310
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481746/310-40-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Period of increase in weighted average maturity of financing receivable modified for debtor experiencing financial difficulty, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of increase (decrease) in amortized cost of financing receivable modified for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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- Details

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- Details

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Data Type:	na
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- Details

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Namespace Prefix:
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- Details

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