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Note 7 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Unpaid principal - with no allowance	$ 1,609	$ 2,139
Recorded investment - with no allowance	1,581	2,111
Unpaid principal - with allowance	6,709	3,375
Recorded investment - with allowance	6,709	3,375
Related allowance	2,227	1,051
Unpaid principal	8,318	5,514
Recorded investment	8,290	5,486
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Unpaid principal - with no allowance	180	645
Recorded investment - with no allowance	152	617
Unpaid principal - with allowance	404	406
Recorded investment - with allowance	404	406
Related allowance	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Unpaid principal - with no allowance	41	42
Recorded investment - with no allowance	41	42
Unpaid principal - with allowance	326	326
Recorded investment - with allowance	326	326
Related allowance	194	176
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Unpaid principal - with no allowance	714	684
Recorded investment - with no allowance	714	684
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Unpaid principal - with no allowance	587	563
Recorded investment - with no allowance	587	563
Unpaid principal - with allowance	4,387	904
Recorded investment - with allowance	4,387	904
Related allowance	1,325	149
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Unpaid principal - with no allowance	87	129
Recorded investment - with no allowance	87	129
Unpaid principal - with allowance	337	478
Recorded investment - with allowance	337	478
Related allowance	34	48
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Unpaid principal - with no allowance	0	76
Recorded investment - with no allowance	0	76
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Unpaid principal - with allowance	1,255	1,261
Recorded investment - with allowance	1,255	1,261
Related allowance	$ 674	$ 678

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

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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)(3)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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- Definition

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(4)
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+ References

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-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

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-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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 14A
-Subparagraph (b)
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+ References

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-SubTopic 10
-Section 50
-Paragraph 15
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