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Note 7 - Loans Receivable and Credit Disclosures - Average Recorded Investment and Interest Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Impaired financing receivable, with no related allowance, average recorded investment	$ 2,126	$ 15,001	$ 2,568	$ 12,266
Impaired financing receivable, with no related allowance, interest income, accrual method	8	361	355	369
Impaired financing receivable, with related allowance, average recorded investment	10,472	2,145	10,906	1,933
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	12,598	17,146	13,474	14,199
Impaired financing receivable, interest income, accrual method	8	361	355	369
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	0	83	84	41
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, with related allowance, average recorded investment	0	0	0	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	0	83	84	41
Impaired financing receivable, interest income, accrual method	0	0	0	0
Family Residential Real Estate 1-4 [Member]
Impaired financing receivable, with no related allowance, average recorded investment	813	305	587	294
Impaired financing receivable, with no related allowance, interest income, accrual method	8	0	19	0
Impaired financing receivable, with related allowance, average recorded investment	164	957	336	938
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	977	1,262	923	1,232
Impaired financing receivable, interest income, accrual method	8	0	19	0
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	132	11,091	162	8,221
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	297	0
Impaired financing receivable, with related allowance, average recorded investment	9,922	0	9,969	244
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	10,054	11,091	10,131	8,465
Impaired financing receivable, interest income, accrual method	0	0	297	0
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	602	1,966	990	1,202
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	25	6
Impaired financing receivable, with related allowance, average recorded investment	0	0	0	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	602	1,966	990	1,202
Impaired financing receivable, interest income, accrual method	0	0	25	6
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	255	735	400	586
Impaired financing receivable, with no related allowance, interest income, accrual method	0	21	0	23
Impaired financing receivable, with related allowance, average recorded investment	29	627	181	356
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	284	1,362	581	942
Impaired financing receivable, interest income, accrual method	0	21	0	23
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	318	813	339	1,896
Impaired financing receivable, with no related allowance, interest income, accrual method	0	340	14	340
Impaired financing receivable, with related allowance, average recorded investment	327	531	385	380
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	645	1,344	724	2,276
Impaired financing receivable, interest income, accrual method	0	340	14	340
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	6	8	6	26
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, with related allowance, average recorded investment	30	30	35	15
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	36	38	41	41
Impaired financing receivable, interest income, accrual method	$ 0	$ 0	$ 0	$ 0

X

- Definition

Average 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 15
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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-Topic 310
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-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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- Definition

Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ 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
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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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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
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+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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-Publisher FASB
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5258-111524

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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