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Note 4 - Allowance for Credit Losses - Impaired Loans and Related Allowances (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2022
Impaired loans, unpaid principal balance	$ 2,462	$ 4,202
Impaired loans, recorded investment with no allowance	2,130	1,588
Impaired loans, recorded investment with allowance	0	1,085
Impaired loans, total recorded investment	2,130	2,673
Impaired loans, related allowance	0	888
Impaired loans, average recorded investment	2,252	1,282
Impaired loans, interest income recognized	1	126
Real Estate 1 [Member] | Construction and Land Development [Member]
Impaired loans, unpaid principal balance		2,412
Impaired loans, recorded investment with no allowance		1,045
Impaired loans, recorded investment with allowance		0
Impaired loans, total recorded investment		1,045
Impaired loans, related allowance		0
Impaired loans, average recorded investment		30
Impaired loans, interest income recognized		75
Real Estate 1 [Member] | Secured by Multi-family Residential Properties [Member]
Impaired loans, unpaid principal balance	743	680
Impaired loans, recorded investment with no allowance	618	530
Impaired loans, recorded investment with allowance	0	0
Impaired loans, total recorded investment	618	530
Impaired loans, related allowance	0	0
Impaired loans, average recorded investment	732	580
Impaired loans, interest income recognized	1	11
Real Estate 1 [Member] | Other Real Estate Loans [Member]
Impaired loans, unpaid principal balance	39	26
Impaired loans, recorded investment with no allowance	28	13
Impaired loans, recorded investment with allowance	0	0
Impaired loans, total recorded investment	28	13
Impaired loans, related allowance	0	0
Impaired loans, average recorded investment	29	22
Impaired loans, interest income recognized	0	0
Commercial and Industrial Loans [Member]
Impaired loans, unpaid principal balance	1,680	1,084
Impaired loans, recorded investment with no allowance	1,484	0
Impaired loans, recorded investment with allowance	0	1,085
Impaired loans, total recorded investment	1,484	1,085
Impaired loans, related allowance	0	888
Impaired loans, average recorded investment	1,491	650
Impaired loans, interest income recognized	$ 0	$ 40

X

- Definition

Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-17

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X

- Definition

Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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- Definition

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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+ References

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-14A

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- Definition

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+ References

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-Section 50
-Paragraph 14A
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-Publisher FASB
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