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Note 7 - Loans Receivable and Credit Disclosures - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Impaired financing receivable, with no related allowance, average recorded investment	$ 1,525
Impaired financing receivable, with no related allowance, interest income, accrual method		$ 29	$ 1,650	$ 36
Impaired financing receivable, with related allowance, average recorded investment	10,158
Impaired financing receivable, with related allowance, interest income, accrual method		1	10,239	1
Impaired financing receivable, average recorded investment	11,683
Impaired financing receivable, interest income, accrual method		30	11,889	37
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	0
Impaired financing receivable, with no related allowance, interest income, accrual method		0	0	0
Impaired financing receivable, with related allowance, average recorded investment	0
Impaired financing receivable, with related allowance, interest income, accrual method		0	0	0
Impaired financing receivable, average recorded investment	0
Impaired financing receivable, interest income, accrual method		0	0	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable, with no related allowance, average recorded investment	687
Impaired financing receivable, with no related allowance, interest income, accrual method		14	683	17
Impaired financing receivable, with related allowance, average recorded investment	163
Impaired financing receivable, with related allowance, interest income, accrual method		1	209	1
Impaired financing receivable, average recorded investment	850
Impaired financing receivable, interest income, accrual method		15	892	18
Multifamily [Member]
Impaired financing receivable, with no related allowance, average recorded investment	0
Impaired financing receivable, with no related allowance, interest income, accrual method		0	0	0
Impaired financing receivable, with related allowance, average recorded investment	0
Impaired financing receivable, with related allowance, interest income, accrual method		0	0	0
Impaired financing receivable, average recorded investment	0
Impaired financing receivable, interest income, accrual method		0	0	0
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	120
Impaired financing receivable, with no related allowance, interest income, accrual method		0	121	0
Impaired financing receivable, with related allowance, average recorded investment	9,632
Impaired financing receivable, with related allowance, interest income, accrual method		0	9,644	0
Impaired financing receivable, average recorded investment	9,752
Impaired financing receivable, interest income, accrual method		0	9,765	0
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	357
Impaired financing receivable, with no related allowance, interest income, accrual method		14	420	14
Impaired financing receivable, with related allowance, average recorded investment	0
Impaired financing receivable, with related allowance, interest income, accrual method		0	0	0
Impaired financing receivable, average recorded investment	357
Impaired financing receivable, interest income, accrual method		14	420	14
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	214
Impaired financing receivable, with no related allowance, interest income, accrual method		1	220	5
Impaired financing receivable, with related allowance, average recorded investment	38
Impaired financing receivable, with related allowance, interest income, accrual method		0	58	0
Impaired financing receivable, average recorded investment	252
Impaired financing receivable, interest income, accrual method		1	278	5
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	143
Impaired financing receivable, with no related allowance, interest income, accrual method		0	202	0
Impaired financing receivable, with related allowance, average recorded investment	305
Impaired financing receivable, with related allowance, interest income, accrual method		0	308	0
Impaired financing receivable, average recorded investment	448
Impaired financing receivable, interest income, accrual method		0	510	0
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	4
Impaired financing receivable, with no related allowance, interest income, accrual method		0	4	0
Impaired financing receivable, with related allowance, average recorded investment	20
Impaired financing receivable, with related allowance, interest income, accrual method		0	20	0
Impaired financing receivable, average recorded investment	$ 24
Impaired financing receivable, interest income, accrual method		$ 0	$ 24	$ 0

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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- Definition

Amount of interest income recognized 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)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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- Definition

Amount of average investment of impaired financing receivables for which there is no 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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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, for which there is no 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)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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+ 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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- Definition

Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as 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)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-15

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