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Note 8 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Impaired financing receivable with no related allowance, recorded investment	$ 15,018	$ 4,044
Impaired financing receivable with no related allowance, unpaid principal balance	15,606	4,920
Impaired financing receivable with related allowance, recorded investment	2,694	744
Impaired financing receivable with related allowance, unpaid principal balance	3,025	755
Impaired financing receivable, related allowance	721	209
Impaired financing receivable, recorded investment	17,712	4,788
Impaired financing receivable, unpaid principal balance	18,631	5,675
Construction Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment
Impaired financing receivable with no related allowance, unpaid principal balance
Impaired financing receivable with related allowance, recorded investment
Impaired financing receivable with related allowance, unpaid principal balance
Impaired financing receivable, related allowance
Impaired financing receivable, recorded investment
Impaired financing receivable, unpaid principal balance
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable with no related allowance, recorded investment	104	460
Impaired financing receivable with no related allowance, unpaid principal balance	139	796
Impaired financing receivable with related allowance, recorded investment	1,094	744
Impaired financing receivable with related allowance, unpaid principal balance	1,425	755
Impaired financing receivable, related allowance	213	209
Impaired financing receivable, recorded investment	1,198	1,204
Impaired financing receivable, unpaid principal balance	1,564	1,551
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	10,618	83
Impaired financing receivable with no related allowance, unpaid principal balance	10,956	435
Impaired financing receivable with related allowance, recorded investment	976
Impaired financing receivable with related allowance, unpaid principal balance	976
Impaired financing receivable, related allowance	435
Impaired financing receivable, recorded investment	11,594	83
Impaired financing receivable, unpaid principal balance	11,932	435
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	794	84
Impaired financing receivable with no related allowance, unpaid principal balance	808	97
Impaired financing receivable with related allowance, recorded investment
Impaired financing receivable with related allowance, unpaid principal balance
Impaired financing receivable, related allowance
Impaired financing receivable, recorded investment	794	84
Impaired financing receivable, unpaid principal balance	808	97
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	412	462
Impaired financing receivable with no related allowance, unpaid principal balance	459	517
Impaired financing receivable with related allowance, recorded investment	168
Impaired financing receivable with related allowance, unpaid principal balance	168
Impaired financing receivable, related allowance	28
Impaired financing receivable, recorded investment	580	462
Impaired financing receivable, unpaid principal balance	627	517
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	3,006	2,951
Impaired financing receivable with no related allowance, unpaid principal balance	3,160	3,071
Impaired financing receivable with related allowance, recorded investment	456
Impaired financing receivable with related allowance, unpaid principal balance	456
Impaired financing receivable, related allowance	45
Impaired financing receivable, recorded investment	3,462	2,951
Impaired financing receivable, unpaid principal balance	3,616	3,071
Consumer and Other [Member]
Impaired financing receivable with no related allowance, recorded investment	84	4
Impaired financing receivable with no related allowance, unpaid principal balance	84	4
Impaired financing receivable with related allowance, recorded investment
Impaired financing receivable with related allowance, unpaid principal balance
Impaired financing receivable, related allowance
Impaired financing receivable, recorded investment	84	4
Impaired financing receivable, unpaid principal balance	$ 84	$ 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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X

- 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

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 (a)(4)
-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 14A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953550-111524

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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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Amount of investment in 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 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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