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Note 8 - Loans - Payment Defaults on TDR Loans (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Troubled debt restructurings, number of loans	11	0
Troubled debt restructurings, recorded investment	$ 530	$ 0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member]
Troubled debt restructurings, number of loans	1	0
Troubled debt restructurings, recorded investment	$ 261	$ 0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member]
Troubled debt restructurings, number of loans	1	0
Troubled debt restructurings, recorded investment	$ 18	$ 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Troubled debt restructurings, number of loans	8	0
Troubled debt restructurings, recorded investment	$ 170	$ 0
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Troubled debt restructurings, number of loans	1	0
Troubled debt restructurings, recorded investment	$ 81	$ 0

X

- Definition

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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