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Note 7 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Impaired financing receivable with no related allowance, recorded investment	$ 2,284	$ 3,148
Impaired financing receivable with no related allowance, unpaid principal balance	2,656	3,788
Impaired financing receivable with related allowance, recorded investment	10,412	12,125
Impaired financing receivable with related allowance, unpaid principal balance	10,559	13,205
Impaired financing receivable, related allowance	1,661	1,819
Impaired financing receivable, recorded investment	12,696	15,273
Impaired financing receivable, unpaid principal balance	13,215	16,993
Construction Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	0	167
Impaired financing receivable with no related allowance, unpaid principal balance	0	167
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	167
Impaired financing receivable, unpaid principal balance	0	167
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable with no related allowance, recorded investment	932	416
Impaired financing receivable with no related allowance, unpaid principal balance	995	475
Impaired financing receivable with related allowance, recorded investment	21	924
Impaired financing receivable with related allowance, unpaid principal balance	21	1,278
Impaired financing receivable, related allowance	15	150
Impaired financing receivable, recorded investment	953	1,340
Impaired financing receivable, unpaid principal balance	1,016	1,753
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	137	242
Impaired financing receivable with no related allowance, unpaid principal balance	167	578
Impaired financing receivable with related allowance, recorded investment	10,016	10,016
Impaired financing receivable with related allowance, unpaid principal balance	10,157	10,157
Impaired financing receivable, related allowance	1,486	1,486
Impaired financing receivable, recorded investment	10,153	10,258
Impaired financing receivable, unpaid principal balance	10,324	10,735
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	628	1,664
Impaired financing receivable with no related allowance, unpaid principal balance	684	1,698
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	628	1,664
Impaired financing receivable, unpaid principal balance	684	1,698
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	271	274
Impaired financing receivable with no related allowance, unpaid principal balance	302	318
Impaired financing receivable with related allowance, recorded investment	0	666
Impaired financing receivable with related allowance, unpaid principal balance	0	1,247
Impaired financing receivable, related allowance	0	115
Impaired financing receivable, recorded investment	271	940
Impaired financing receivable, unpaid principal balance	302	1,565
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	312	377
Impaired financing receivable with no related allowance, unpaid principal balance	504	542
Impaired financing receivable with related allowance, recorded investment	338	482
Impaired financing receivable with related allowance, unpaid principal balance	342	484
Impaired financing receivable, related allowance	132	40
Impaired financing receivable, recorded investment	650	859
Impaired financing receivable, unpaid principal balance	846	1,026
Consumer and Other [Member]
Impaired financing receivable with no related allowance, recorded investment	4	8
Impaired financing receivable with no related allowance, unpaid principal balance	4	10
Impaired financing receivable with related allowance, recorded investment	37	37
Impaired financing receivable with related allowance, unpaid principal balance	39	39
Impaired financing receivable, related allowance	28	28
Impaired financing receivable, recorded investment	41	45
Impaired financing receivable, unpaid principal balance	$ 43	$ 49

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=123577603&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=123577603&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=123577603&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=123577603&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=123577603&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=123577603&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=123577603&loc=d3e5212-111524

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