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Note 8 - Loans - Average Balance of Impaired Loans and Income Recognized on Impaired Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Average investment in impaired loans	$ 6,756	$ 9,113
Interest income recognized on impaired loans on a cash basis	302	333
Residential Portfolio Segment [Member]
Average investment in impaired loans	1,754	1,277
Interest income recognized on impaired loans on a cash basis	103	63
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Average investment in impaired loans	1,440	980
Interest income recognized on impaired loans on a cash basis	87	52
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Average investment in impaired loans	288	297
Interest income recognized on impaired loans on a cash basis	12	11
Residential Portfolio Segment [Member] | Home Equity Line of Credit [Member]
Average investment in impaired loans	26	0
Interest income recognized on impaired loans on a cash basis	4	0
Commercial Portfolio Segment [Member]
Average investment in impaired loans	4,999	7,818
Interest income recognized on impaired loans on a cash basis	199	269
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Average investment in impaired loans	1,562	4,897
Interest income recognized on impaired loans on a cash basis	19	141
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Average investment in impaired loans	1,186	708
Interest income recognized on impaired loans on a cash basis	25	47
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Average investment in impaired loans	556	0
Interest income recognized on impaired loans on a cash basis	71	0
Commercial Portfolio Segment [Member] | Loans Secured by Farmland [Member]
Average investment in impaired loans	1,276	1,357
Interest income recognized on impaired loans on a cash basis	49	35
Commercial Portfolio Segment [Member] | Multifamily 5 or More Residential [Member]
Average investment in impaired loans	0	314
Interest income recognized on impaired loans on a cash basis	0	0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Average investment in impaired loans	399	542
Interest income recognized on impaired loans on a cash basis	31	46
Commercial Portfolio Segment [Member] | Other Commercial Loans [Member]
Average investment in impaired loans	20	0
Interest income recognized on impaired loans on a cash basis	4	0
Consumer Portfolio Segment [Member]
Average investment in impaired loans	3	18
Interest income recognized on impaired loans on a cash basis	$ 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=118936363&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=118936363&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=118936363&loc=d3e5212-111524

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