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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
	Mar. 31, 2022	Mar. 31, 2021
Impaired financing receivable, with no related allowance, average recorded investment	$ 1,852	$ 3,010
Impaired financing receivable, with no related allowance, interest income, accrual method	7	335
Impaired financing receivable, with related allowance, average recorded investment	10,385	11,341
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	12,237	14,351
Impaired financing receivable, interest income, accrual method	7	335
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	0	167
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0
Impaired financing receivable, with related allowance, average recorded investment	0	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	0	167
Impaired financing receivable, interest income, accrual method	0	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable, with no related allowance, average recorded investment	664	361
Impaired financing receivable, with no related allowance, interest income, accrual method	3	0
Impaired financing receivable, with related allowance, average recorded investment	314	509
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	978	870
Impaired financing receivable, interest income, accrual method	3	0
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	123	192
Impaired financing receivable, with no related allowance, interest income, accrual method	0	297
Impaired financing receivable, with related allowance, average recorded investment	9,668	10,016
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	9,791	10,208
Impaired financing receivable, interest income, accrual method	0	297
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	544	1,378
Impaired financing receivable, with no related allowance, interest income, accrual method	0	25
Impaired financing receivable, with related allowance, average recorded investment	0	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	544	1,378
Impaired financing receivable, interest income, accrual method	0	25
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	227	546
Impaired financing receivable, with no related allowance, interest income, accrual method	4	0
Impaired financing receivable, with related allowance, average recorded investment	70	333
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	297	879
Impaired financing receivable, interest income, accrual method	4	0
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	289	360
Impaired financing receivable, with no related allowance, interest income, accrual method	0	13
Impaired financing receivable, with related allowance, average recorded investment	312	443
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	601	803
Impaired financing receivable, interest income, accrual method	0	13
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	5	6
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0
Impaired financing receivable, with related allowance, average recorded investment	21	40
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	26	46
Impaired financing receivable, interest income, accrual method	$ 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
-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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- 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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+ References

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-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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-SubTopic 10
-Section 50
-Paragraph 15
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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 15
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