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Note 7 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Impaired financing receivable with no related allowance, recorded investment	$ 1,965	$ 3,148
Impaired financing receivable with no related allowance, unpaid principal balance	2,323	3,788
Impaired financing receivable with related allowance, recorded investment	10,528	12,125
Impaired financing receivable with related allowance, unpaid principal balance	10,794	13,205
Impaired financing receivable, related allowance	1,539	1,819
Impaired financing receivable, recorded investment	12,493	15,273
Impaired financing receivable, unpaid principal balance	13,117	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	694	416
Impaired financing receivable with no related allowance, unpaid principal balance	747	475
Impaired financing receivable with related allowance, recorded investment	306	924
Impaired financing receivable with related allowance, unpaid principal balance	316	1,278
Impaired financing receivable, related allowance	40	150
Impaired financing receivable, recorded investment	1,000	1,340
Impaired financing receivable, unpaid principal balance	1,063	1,753
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	127	242
Impaired financing receivable with no related allowance, unpaid principal balance	142	578
Impaired financing receivable with related allowance, recorded investment	9,827	10,016
Impaired financing receivable with related allowance, unpaid principal balance	10,081	10,157
Impaired financing receivable, related allowance	1,326	1,486
Impaired financing receivable, recorded investment	9,954	10,258
Impaired financing receivable, unpaid principal balance	10,223	10,735
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	576	1,664
Impaired financing receivable with no related allowance, unpaid principal balance	631	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	576	1,664
Impaired financing receivable, unpaid principal balance	631	1,698
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	238	274
Impaired financing receivable with no related allowance, unpaid principal balance	271	318
Impaired financing receivable with related allowance, recorded investment	57	666
Impaired financing receivable with related allowance, unpaid principal balance	58	1,247
Impaired financing receivable, related allowance	18	115
Impaired financing receivable, recorded investment	295	940
Impaired financing receivable, unpaid principal balance	329	1,565
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	323	377
Impaired financing receivable with no related allowance, unpaid principal balance	523	542
Impaired financing receivable with related allowance, recorded investment	315	482
Impaired financing receivable with related allowance, unpaid principal balance	315	484
Impaired financing receivable, related allowance	132	40
Impaired financing receivable, recorded investment	638	859
Impaired financing receivable, unpaid principal balance	838	1,026
Consumer and Other [Member]
Impaired financing receivable with no related allowance, recorded investment	7	8
Impaired financing receivable with no related allowance, unpaid principal balance	9	10
Impaired financing receivable with related allowance, recorded investment	23	37
Impaired financing receivable with related allowance, unpaid principal balance	24	39
Impaired financing receivable, related allowance	23	28
Impaired financing receivable, recorded investment	30	45
Impaired financing receivable, unpaid principal balance	$ 33	$ 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

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=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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