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Note 8 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Impaired financing receivable with no related allowance, recorded investment	$ 14,870	$ 4,044
Impaired financing receivable with no related allowance, unpaid principal balance	16,504	4,920
Impaired financing receivable with related allowance, recorded investment	1,518	744
Impaired financing receivable with related allowance, unpaid principal balance	1,859	755
Impaired financing receivable, related allowance	223	209
Impaired financing receivable, recorded investment	16,388	4,788
Impaired financing receivable, unpaid principal balance	18,363	5,675
Construction Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	165	0
Impaired financing receivable with no related allowance, unpaid principal balance	165	0
Impaired financing receivable with related allowance, recorded investment	0	0
Impaired financing receivable with related allowance, unpaid principal balance	0	0
Impaired financing receivable, related allowance	0	0
Impaired financing receivable, recorded investment	165	0
Impaired financing receivable, unpaid principal balance	165	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable with no related allowance, recorded investment	386	460
Impaired financing receivable with no related allowance, unpaid principal balance	436	796
Impaired financing receivable with related allowance, recorded investment	946	744
Impaired financing receivable with related allowance, unpaid principal balance	1,283	755
Impaired financing receivable, related allowance	150	209
Impaired financing receivable, recorded investment	1,332	1,204
Impaired financing receivable, unpaid principal balance	1,719	1,551
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	11,046	83
Impaired financing receivable with no related allowance, unpaid principal balance	11,836	435
Impaired financing receivable with related allowance, recorded investment	0	0
Impaired financing receivable with related allowance, unpaid principal balance	0	0
Impaired financing receivable, related allowance	0	0
Impaired financing receivable, recorded investment	11,046	83
Impaired financing receivable, unpaid principal balance	11,836	435
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	1,868	84
Impaired financing receivable with no related allowance, unpaid principal balance	1,885	97
Impaired financing receivable with related allowance, recorded investment	0	0
Impaired financing receivable with related allowance, unpaid principal balance	0	0
Impaired financing receivable, related allowance	0	0
Impaired financing receivable, recorded investment	1,868	84
Impaired financing receivable, unpaid principal balance	1,885	97
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	947	462
Impaired financing receivable with no related allowance, unpaid principal balance	1,567	517
Impaired financing receivable with related allowance, recorded investment	2	0
Impaired financing receivable with related allowance, unpaid principal balance	2	0
Impaired financing receivable, related allowance	2	0
Impaired financing receivable, recorded investment	949	462
Impaired financing receivable, unpaid principal balance	1,569	517
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	448	2,951
Impaired financing receivable with no related allowance, unpaid principal balance	605	3,071
Impaired financing receivable with related allowance, recorded investment	529	0
Impaired financing receivable with related allowance, unpaid principal balance	531	0
Impaired financing receivable, related allowance	41	0
Impaired financing receivable, recorded investment	977	2,951
Impaired financing receivable, unpaid principal balance	1,136	3,071
Consumer and Other [Member]
Impaired financing receivable with no related allowance, recorded investment	10	4
Impaired financing receivable with no related allowance, unpaid principal balance	10	4
Impaired financing receivable with related allowance, recorded investment	41	0
Impaired financing receivable with related allowance, unpaid principal balance	43	0
Impaired financing receivable, related allowance	30	0
Impaired financing receivable, recorded investment	51	4
Impaired financing receivable, unpaid principal balance	$ 53	$ 4

X

- Definition

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 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ 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 (a)(3)
-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 15
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&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 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

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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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&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 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

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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 (a)(4)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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