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Note 8 - Loans - Impaired Loans (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Unpaid principal - with no allowance	$ 2,139	$ 4,952
Recorded investment - with no allowance	2,111	4,923
Unpaid principal - with allowance	3,375	4,851
Recorded investment - with allowance	3,375	4,851
Related allowance	1,051	1,605
Unpaid principal	5,514	9,803
Recorded investment	5,486	9,774
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Unpaid principal - with no allowance	645	750
Recorded investment - with no allowance	617	721
Unpaid principal - with allowance	406	270
Recorded investment - with allowance	406	270
Related allowance	0	0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Unpaid principal - with no allowance	42	54
Recorded investment - with no allowance	42	54
Unpaid principal - with allowance	326	239
Recorded investment - with allowance	326	239
Related allowance	176	116
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Unpaid principal - with no allowance	684	1,787
Recorded investment - with no allowance	684	1,787
Unpaid principal - with allowance	0	2,515
Recorded investment - with allowance	0	2,515
Related allowance	0	781
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Unpaid principal - with no allowance	563	817
Recorded investment - with no allowance	563	817
Unpaid principal - with allowance	904	1,340
Recorded investment - with allowance	904	1,340
Related allowance	149	659
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Unpaid principal - with no allowance	129	862
Recorded investment - with no allowance	129	862
Unpaid principal - with allowance	478	487
Recorded investment - with allowance	478	487
Related allowance	48	49
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Unpaid principal - with no allowance	76	665
Recorded investment - with no allowance	76	665
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Unpaid principal - with allowance	1,261	0
Recorded investment - with allowance	1,261	0
Related allowance	678	0
Consumer Portfolio Segment [Member]
Unpaid principal - with no allowance	0	17
Recorded investment - with no allowance	$ 0	$ 17

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=118936363&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=118936363&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=118936363&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=118936363&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=118936363&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)
-URI http://asc.fasb.org/extlink&oid=118936363&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=118936363&loc=d3e5212-111524

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