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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, 2021	Mar. 31, 2020
Impaired financing receivable, with no related allowance, average recorded investment	$ 3,010	$ 9,533
Impaired financing receivable, with no related allowance, interest income, accrual method	335	6
Impaired financing receivable, with related allowance, average recorded investment	11,341	1,719
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	14,351	11,252
Impaired financing receivable, interest income, accrual method	335	6
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	167	0
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	167	0
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	361	283
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0
Impaired financing receivable, with related allowance, average recorded investment	509	919
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	870	1,202
Impaired financing receivable, interest income, accrual method	0	0
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	192	5,351
Impaired financing receivable, with no related allowance, interest income, accrual method	297	0
Impaired financing receivable, with related allowance, average recorded investment	10,016	488
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	10,208	5,839
Impaired financing receivable, interest income, accrual method	297	0
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	1,378	439
Impaired financing receivable, with no related allowance, interest income, accrual method	25	6
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	1,378	439
Impaired financing receivable, interest income, accrual method	25	6
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	546	437
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0
Impaired financing receivable, with related allowance, average recorded investment	333	84
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	879	521
Impaired financing receivable, interest income, accrual method	0	0
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	360	2,979
Impaired financing receivable, with no related allowance, interest income, accrual method	13	0
Impaired financing receivable, with related allowance, average recorded investment	443	228
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	803	3,207
Impaired financing receivable, interest income, accrual method	13	0
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	6	44
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0
Impaired financing receivable, with related allowance, average recorded investment	40	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0
Impaired financing receivable, average recorded investment	46	44
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 http://asc.fasb.org/extlink&oid=121611835&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 http://asc.fasb.org/extlink&oid=121611835&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 http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

Reference 2: 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 http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5258-111524

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+ 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)
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