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Note 8 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Impaired financing receivable with no related allowance, recorded investment	$ 15,130	$ 4,044
Impaired financing receivable with no related allowance, unpaid principal balance	16,164	4,920
Impaired financing receivable with related allowance, recorded investment	2,771	744
Impaired financing receivable with related allowance, unpaid principal balance	3,098	755
Impaired financing receivable, related allowance	754	209
Impaired financing receivable, recorded investment	17,901	4,788
Impaired financing receivable, unpaid principal balance	19,262	5,675
Construction Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	0	0
Impaired financing receivable with no related allowance, unpaid principal balance	0	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	0	0
Impaired financing receivable, unpaid principal balance	0	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable with no related allowance, recorded investment	224	460
Impaired financing receivable with no related allowance, unpaid principal balance	269	796
Impaired financing receivable with related allowance, recorded investment	968	744
Impaired financing receivable with related allowance, unpaid principal balance	1,293	755
Impaired financing receivable, related allowance	150	209
Impaired financing receivable, recorded investment	1,192	1,204
Impaired financing receivable, unpaid principal balance	1,562	1,551
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	11,136	83
Impaired financing receivable with no related allowance, unpaid principal balance	11,907	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	11,136	83
Impaired financing receivable, unpaid principal balance	11,907	435
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	2,063	84
Impaired financing receivable with no related allowance, unpaid principal balance	2,079	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	2,063	84
Impaired financing receivable, unpaid principal balance	2,079	97
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	523	462
Impaired financing receivable with no related allowance, unpaid principal balance	568	517
Impaired financing receivable with related allowance, recorded investment	1,252	0
Impaired financing receivable with related allowance, unpaid principal balance	1,252	0
Impaired financing receivable, related allowance	558	0
Impaired financing receivable, recorded investment	1,775	462
Impaired financing receivable, unpaid principal balance	1,820	517
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	1,178	2,951
Impaired financing receivable with no related allowance, unpaid principal balance	1,335	3,071
Impaired financing receivable with related allowance, recorded investment	533	0
Impaired financing receivable with related allowance, unpaid principal balance	535	0
Impaired financing receivable, related allowance	40	0
Impaired financing receivable, recorded investment	1,711	2,951
Impaired financing receivable, unpaid principal balance	1,870	3,071
Consumer and Other [Member]
Impaired financing receivable with no related allowance, recorded investment	6	4
Impaired financing receivable with no related allowance, unpaid principal balance	6	4
Impaired financing receivable with related allowance, recorded investment	18	0
Impaired financing receivable with related allowance, unpaid principal balance	18	0
Impaired financing receivable, related allowance	6	0
Impaired financing receivable, recorded investment	24	4
Impaired financing receivable, unpaid principal balance	$ 24	$ 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

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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+ 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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