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Note 7 - Loans Receivable and Credit Disclosures - Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Impaired financing receivable with no related allowance, recorded investment	$ 2,869	$ 3,148
Impaired financing receivable with no related allowance, unpaid principal balance	3,933	3,788
Impaired financing receivable with related allowance, recorded investment	10,555	12,125
Impaired financing receivable with related allowance, unpaid principal balance	10,710	13,205
Impaired financing receivable, related allowance	1,656	1,819
Impaired financing receivable, recorded investment	13,424	15,273
Impaired financing receivable, unpaid principal balance	14,643	16,993
Construction Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	167	167
Impaired financing receivable with no related allowance, unpaid principal balance	167	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	167	167
Impaired financing receivable, unpaid principal balance	167	167
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable with no related allowance, recorded investment	306	416
Impaired financing receivable with no related allowance, unpaid principal balance	360	475
Impaired financing receivable with related allowance, recorded investment	93	924
Impaired financing receivable with related allowance, unpaid principal balance	98	1,278
Impaired financing receivable, related allowance	17	150
Impaired financing receivable, recorded investment	399	1,340
Impaired financing receivable, unpaid principal balance	458	1,753
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	141	242
Impaired financing receivable with no related allowance, unpaid principal balance	168	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	10,157	10,258
Impaired financing receivable, unpaid principal balance	10,325	10,735
Agriculture Real Estate [Member]
Impaired financing receivable with no related allowance, recorded investment	1,091	1,664
Impaired financing receivable with no related allowance, unpaid principal balance	1,140	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	1,091	1,664
Impaired financing receivable, unpaid principal balance	1,140	1,698
Commercial Portfolio Segment [Member]
Impaired financing receivable with no related allowance, recorded investment	817	274
Impaired financing receivable with no related allowance, unpaid principal balance	1,560	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	817	940
Impaired financing receivable, unpaid principal balance	1,560	1,565
Agriculture [Member]
Impaired financing receivable with no related allowance, recorded investment	343	377
Impaired financing receivable with no related allowance, unpaid principal balance	533	542
Impaired financing receivable with related allowance, recorded investment	404	482
Impaired financing receivable with related allowance, unpaid principal balance	411	484
Impaired financing receivable, related allowance	120	40
Impaired financing receivable, recorded investment	747	859
Impaired financing receivable, unpaid principal balance	944	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	5	10
Impaired financing receivable with related allowance, recorded investment	42	37
Impaired financing receivable with related allowance, unpaid principal balance	44	39
Impaired financing receivable, related allowance	33	28
Impaired financing receivable, recorded investment	46	45
Impaired financing receivable, unpaid principal balance	$ 49	$ 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=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

Amount of unpaid principal balance of impaired financing receivables for which there is no 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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+ 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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