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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
	Mar. 31, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Impaired financing receivable, with no related allowance, average recorded investment	$ 1,525	$ 2,578	$ 1,650	$ 2,766
Impaired financing receivable, with no related allowance, interest income, accrual method	29	12	36	347
Impaired financing receivable, with related allowance, average recorded investment	10,158	10,484	10,239	11,031
Impaired financing receivable, with related allowance, interest income, accrual method	1	0	1	0
Impaired financing receivable, average recorded investment	11,683	13,062	11,889	13,797
Impaired financing receivable, interest income, accrual method	30	12	37	347
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	0	84	0	111
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, with related allowance, average recorded investment	0	0	0	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	0	84	0	111
Impaired financing receivable, interest income, accrual method	0	0	0	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable, with no related allowance, average recorded investment	687	619	683	551
Impaired financing receivable, with no related allowance, interest income, accrual method	14	11	17	11
Impaired financing receivable, with related allowance, average recorded investment	163	57	209	346
Impaired financing receivable, with related allowance, interest income, accrual method	1	0	1	0
Impaired financing receivable, average recorded investment	850	676	892	897
Impaired financing receivable, interest income, accrual method	15	11	18	11
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	120	139	121	173
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	0	297
Impaired financing receivable, with related allowance, average recorded investment	9,632	10,016	9,644	10,016
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	9,752	10,155	9,765	10,189
Impaired financing receivable, interest income, accrual method	0	0	0	297
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	357	860	420	1,128
Impaired financing receivable, with no related allowance, interest income, accrual method	14	0	14	25
Impaired financing receivable, with related allowance, average recorded investment	0	0	0	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	357	860	420	1,128
Impaired financing receivable, interest income, accrual method	14	0	14	25
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	214	544	220	454
Impaired financing receivable, with no related allowance, interest income, accrual method	1	0	5	0
Impaired financing receivable, with related allowance, average recorded investment	38	0	58	222
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	252	544	278	676
Impaired financing receivable, interest income, accrual method	1	0	5	0
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	143	328	202	344
Impaired financing receivable, with no related allowance, interest income, accrual method	0	1	0	14
Impaired financing receivable, with related allowance, average recorded investment	305	371	308	408
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	448	699	510	752
Impaired financing receivable, interest income, accrual method	0	1	0	14
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	4	4	4	5
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, with related allowance, average recorded investment	20	40	20	39
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	24	44	24	44
Impaired financing receivable, interest income, accrual method	$ 0	$ 0	$ 0	$ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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