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Note 8 - 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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Impaired financing receivable, with no related allowance, average recorded investment	$ 15,001	$ 3,533	$ 12,266	$ 2,112
Impaired financing receivable, with no related allowance, interest income, accrual method	361	49	369	135
Impaired financing receivable, with related allowance, average recorded investment	2,145	1,613	1,933	2,103
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	1
Impaired financing receivable, average recorded investment	17,146	5,146	14,199	4,215
Impaired financing receivable, interest income, accrual method	361	49	369	136
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	83	0	41	0
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	83	0	41	0
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	305	364	294	305
Impaired financing receivable, with no related allowance, interest income, accrual method	0	4	0	30
Impaired financing receivable, with related allowance, average recorded investment	957	341	938	226
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	1,262	705	1,232	531
Impaired financing receivable, interest income, accrual method	0	4	0	30
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	11,091	637	8,221	384
Impaired financing receivable, with no related allowance, interest income, accrual method	0	45	0	105
Impaired financing receivable, with related allowance, average recorded investment	0	0	244	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	11,091	637	8,465	384
Impaired financing receivable, interest income, accrual method	0	45	0	105
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	1,966	86	1,202	79
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	6	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	1,966	86	1,202	79
Impaired financing receivable, interest income, accrual method	0	0	6	0
Commercial Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	735	240	586	241
Impaired financing receivable, with no related allowance, interest income, accrual method	21	0	23	0
Impaired financing receivable, with related allowance, average recorded investment	627	1,267	356	1,867
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	1,362	1,507	942	2,108
Impaired financing receivable, interest income, accrual method	21	0	23	0
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	813	2,206	1,896	1,103
Impaired financing receivable, with no related allowance, interest income, accrual method	340	0	340	0
Impaired financing receivable, with related allowance, average recorded investment	531	0	380	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	1,344	2,206	2,276	1,103
Impaired financing receivable, interest income, accrual method	340	0	340	0
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	8	0	26	0
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	5	15	10
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	1
Impaired financing receivable, average recorded investment	38	5	41	10
Impaired financing receivable, interest income, accrual method	$ 0	$ 0	$ 0	$ 1

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=121611835&loc=d3e5212-111524

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
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-Section 50
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=121611835&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=121611835&loc=d3e5258-111524

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Amount of interest income, recognized on accrual basis, on financing receivables that are recognized as impaired, 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
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+ References

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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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Amount of interest income, recognized on accrual basis, on financing receivables, for which there is a related allowance for credit losses and are recognized as impaired.

+ References

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-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
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