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Note 8 - Loans - Nonaccrual Loans and Loans Past Due Ninety Days or More and Still Accruing (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Loans past due 90+ days and accruing	$ 1,207	$ 2,906
Nonaccrual loans	9,218	13,113
Residential Portfolio Segment [Member]
Loans past due 90+ days and accruing	1,002	2,003
Nonaccrual loans	5,078	5,016
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Loans past due 90+ days and accruing	878	1,633
Nonaccrual loans	4,679	4,750
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Loans past due 90+ days and accruing	53	151
Nonaccrual loans	326	239
Residential Portfolio Segment [Member] | Home Equity Line of Credit 1 [Member]
Loans past due 90+ days and accruing	71	219
Nonaccrual loans	73	27
Commercial Portfolio Segment [Member]
Loans past due 90+ days and accruing	165	871
Nonaccrual loans	4,124	8,083
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans past due 90+ days and accruing	107	394
Nonaccrual loans	1,148	3,958
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Loans past due 90+ days and accruing	15	18
Nonaccrual loans	1,051	2,111
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans past due 90+ days and accruing	0	0
Nonaccrual loans	1,311	52
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Loans past due 90+ days and accruing	43	459
Nonaccrual loans	565	1,297
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans past due 90+ days and accruing	0	0
Nonaccrual loans	0	665
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans past due 90+ days and accruing	0	0
Nonaccrual loans	49	0
Consumer Portfolio Segment [Member]
Loans past due 90+ days and accruing	40	32
Nonaccrual loans	$ 16	$ 14

X

- Definition

Amount of financing receivable 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448

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X

- Definition

Amount of financing receivable on nonaccrual status.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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-URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5111-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919258-210447

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