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Note 8 - Loans Receivable and Credit Disclosures - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Impaired financing receivable, with no related allowance, average recorded investment	$ 9,533	$ 695
Impaired financing receivable, with no related allowance, interest income, accrual method	6	51
Impaired financing receivable, with related allowance, average recorded investment	1,719	2,595
Impaired financing receivable, with related allowance, interest income, accrual method		1
Impaired financing receivable, average recorded investment	11,252	3,290
Impaired financing receivable, interest income, accrual method	6	52
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment
Impaired financing receivable, with no related allowance, interest income, accrual method
Impaired financing receivable, with related allowance, average recorded investment
Impaired financing receivable, with related allowance, interest income, accrual method
Impaired financing receivable, average recorded investment
Impaired financing receivable, interest income, accrual method
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable, with no related allowance, average recorded investment	283	247
Impaired financing receivable, with no related allowance, interest income, accrual method		20
Impaired financing receivable, with related allowance, average recorded investment	919	111
Impaired financing receivable, with related allowance, interest income, accrual method
Impaired financing receivable, average recorded investment	1,202	358
Impaired financing receivable, interest income, accrual method		20
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	5,351	131
Impaired financing receivable, with no related allowance, interest income, accrual method		31
Impaired financing receivable, with related allowance, average recorded investment	488
Impaired financing receivable, with related allowance, interest income, accrual method
Impaired financing receivable, average recorded investment	5,839	131
Impaired financing receivable, interest income, accrual method		31
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	439	73
Impaired financing receivable, with no related allowance, interest income, accrual method	6
Impaired financing receivable, with related allowance, average recorded investment
Impaired financing receivable, with related allowance, interest income, accrual method
Impaired financing receivable, average recorded investment	439	73
Impaired financing receivable, interest income, accrual method	6
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	437	243
Impaired financing receivable, with no related allowance, interest income, accrual method
Impaired financing receivable, with related allowance, average recorded investment	84	2,468
Impaired financing receivable, with related allowance, interest income, accrual method
Impaired financing receivable, average recorded investment	521	2,711
Impaired financing receivable, interest income, accrual method
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	2,979
Impaired financing receivable, with no related allowance, interest income, accrual method
Impaired financing receivable, with related allowance, average recorded investment	228
Impaired financing receivable, with related allowance, interest income, accrual method
Impaired financing receivable, average recorded investment	3,207
Impaired financing receivable, interest income, accrual method
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	44	1
Impaired financing receivable, with no related allowance, interest income, accrual method
Impaired financing receivable, with related allowance, average recorded investment		16
Impaired financing receivable, with related allowance, interest income, accrual method		1
Impaired financing receivable, average recorded investment	44	17
Impaired financing receivable, interest income, accrual method		$ 1

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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- Definition

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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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- Definition

Amount of average investment of impaired financing receivables for which there is 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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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
-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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