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Note 7 - Loans - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Troubled debt restructurings, number of contracts	1	11
Troubled debt restructurings, post-modification recorded investment	$ 30	$ 550
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Senior Lien [Member] | Monthly Payment Reduction and Extended Maturity Date [Member]
Troubled debt restructurings, number of contracts	0	1
Troubled debt restructurings, post-modification recorded investment	$ 0	$ 271
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] | Monthly Payment Reduction and Extended Maturity Date [Member]
Troubled debt restructurings, number of contracts	0	1
Troubled debt restructurings, post-modification recorded investment	$ 0	$ 18
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Junior Lien [Member] | New Loan at Lower Than Risk-adjusted Market Rate to Borrower [Member]
Troubled debt restructurings, number of contracts	1	0
Troubled debt restructurings, post-modification recorded investment	$ 30	$ 0
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Monthly Payment Reduction and Extended Maturity Date [Member]
Troubled debt restructurings, number of contracts	0	8
Troubled debt restructurings, post-modification recorded investment	$ 0	$ 177
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Monthly Payment Reduction and Extended Maturity Date [Member]
Troubled debt restructurings, number of contracts	0	1
Troubled debt restructurings, post-modification recorded investment	$ 0	$ 84

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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