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Note 7 - Loans - Average Balance of Impaired Loans and Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Average investment in impaired loans	$ 6,888	$ 8,135
Interest income recognized on impaired loans on a cash basis	44	61
Residential Portfolio Segment [Member]
Average investment in impaired loans	1,679	1,272
Interest income recognized on impaired loans on a cash basis	9	12
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Average investment in impaired loans	1,232	981
Interest income recognized on impaired loans on a cash basis	8	10
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Average investment in impaired loans	382	291
Interest income recognized on impaired loans on a cash basis	0	2
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Average investment in impaired loans	65	0
Interest income recognized on impaired loans on a cash basis	1	0
Commercial Portfolio Segment [Member]
Average investment in impaired loans	5,209	6,855
Interest income recognized on impaired loans on a cash basis	35	49
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Average investment in impaired loans	387	3,040
Interest income recognized on impaired loans on a cash basis	4	10
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Average investment in impaired loans	2,872	1,713
Interest income recognized on impaired loans on a cash basis	1	26
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Average investment in impaired loans	1,308	0
Interest income recognized on impaired loans on a cash basis	12	0
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Average investment in impaired loans	516	1,442
Interest income recognized on impaired loans on a cash basis	17	1
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Average investment in impaired loans	76	660
Interest income recognized on impaired loans on a cash basis	0	12
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Average investment in impaired loans	50	0
Interest income recognized on impaired loans on a cash basis	1	0
Consumer Portfolio Segment [Member]
Average investment in impaired loans	0	8
Interest income recognized on impaired loans on a cash basis	$ 0	$ 0

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
-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

+ Details

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X

- Definition

Amount of interest income recognized on a cash-basis method of accounting 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
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5212-111524

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