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Note 8 - Loans Receivable and Credit Disclosures - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)
Financing receivable modifications, number of contracts	2
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 245
Financing receivable modifications, post modification outstanding, recorded investment	$ 245
Construction Real Estate [Member]
Financing receivable modifications, number of contracts
Financing receivable modifications, pre-modification outstanding, recorded investment
Financing receivable modifications, post modification outstanding, recorded investment
Family Residential Real Estate 1-4 [Member]
Financing receivable modifications, number of contracts
Financing receivable modifications, pre-modification outstanding, recorded investment
Financing receivable modifications, post modification outstanding, recorded investment
Commercial Real Estate Portfolio Segment [Member]
Financing receivable modifications, number of contracts	1
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 184
Financing receivable modifications, post modification outstanding, recorded investment	$ 184
Agriculture Real Estate [Member]
Financing receivable modifications, number of contracts
Financing receivable modifications, pre-modification outstanding, recorded investment
Financing receivable modifications, post modification outstanding, recorded investment
Commercial Portfolio Segment [Member]
Financing receivable modifications, number of contracts	1
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 61
Financing receivable modifications, post modification outstanding, recorded investment	$ 61
Agriculture [Member]
Financing receivable modifications, number of contracts
Financing receivable modifications, pre-modification outstanding, recorded investment
Financing receivable modifications, post modification outstanding, recorded investment
Consumer and Other [Member]
Financing receivable modifications, number of contracts
Financing receivable modifications, pre-modification outstanding, recorded investment
Financing receivable modifications, post modification outstanding, recorded investment

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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- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ 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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