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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		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Impaired financing receivable, with no related allowance, average recorded investment	$ 15,075	$ 1,600	$ 11,397	$ 1,300
Impaired financing receivable, with no related allowance, interest income, accrual method	2	35	8	86
Impaired financing receivable, with related allowance, average recorded investment	2,733	2,631	2,069	2,597
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	1
Impaired financing receivable, average recorded investment	17,808	4,231	13,466	3,897
Impaired financing receivable, interest income, accrual method	2	35	8	87
Construction Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	0	0	0	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	0	0	0	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	164	209	263	223
Impaired financing receivable, with no related allowance, interest income, accrual method	0	6	0	26
Impaired financing receivable, with related allowance, average recorded investment	1,031	89	935	97
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	1,195	298	1,198	320
Impaired financing receivable, interest income, accrual method	0	6	0	26
Commercial Real Estate Portfolio Segment [Member]
Impaired financing receivable, with no related allowance, average recorded investment	10,877	135	7,279	133
Impaired financing receivable, with no related allowance, interest income, accrual method	0	29	0	60
Impaired financing receivable, with related allowance, average recorded investment	488	0	325	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	11,365	135	7,604	133
Impaired financing receivable, interest income, accrual method	0	29	0	60
Agriculture Real Estate [Member]
Impaired financing receivable, with no related allowance, average recorded investment	1,429	78	980	76
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	1,429	78	980	76
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	468	235	466	239
Impaired financing receivable, with no related allowance, interest income, accrual method	2	0	2	0
Impaired financing receivable, with related allowance, average recorded investment	710	2,535	473	2,490
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	1,178	2,770	939	2,729
Impaired financing receivable, interest income, accrual method	2	0	2	0
Agriculture [Member]
Impaired financing receivable, with no related allowance, average recorded investment	2,092	943	2,378	629
Impaired financing receivable, with no related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, with related allowance, average recorded investment	495	0	330	0
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	0
Impaired financing receivable, average recorded investment	2,587	943	2,708	629
Impaired financing receivable, interest income, accrual method	0	0	0	0
Consumer and Other [Member]
Impaired financing receivable, with no related allowance, average recorded investment	45	0	31	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	9	7	6	10
Impaired financing receivable, with related allowance, interest income, accrual method	0	0	0	1
Impaired financing receivable, average recorded investment	54	7	37	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

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-Publisher FASB
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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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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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-Paragraph 15
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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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+ References

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