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Note 8 - Loans Receivable and Credit Disclosures - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)
Financing receivable modifications, number of contracts		3		3
Financing receivable modifications, pre-modification outstanding, recorded investment		$ 1,035		$ 1,035
Financing receivable modifications, post modification outstanding, recorded investment	$ 10,240	$ 1,035	$ 10,485	$ 1,035
Financing Receivables 30 to 89 Days Past Due [Member]
Financing receivable modifications, number of contracts	5		7
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 10,240		$ 10,485
Construction Real Estate [Member]
Financing receivable modifications, number of contracts	0	0	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0	$ 0	$ 0
Family Residential Real Estate 1-4 [Member]
Financing receivable modifications, number of contracts	0	3	0	3
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 1,035	$ 0	$ 1,035
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 1,035	$ 0	$ 1,035
Commercial Real Estate Portfolio Segment [Member]
Financing receivable modifications, number of contracts	1	0	2	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 10,157	$ 0	$ 10,341	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 10,157	$ 0	$ 10,341	$ 0
Agriculture Real Estate [Member]
Financing receivable modifications, number of contracts	0	0	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing receivable modifications, number of contracts	0	0	1	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0	$ 61	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0	$ 61	$ 0
Agriculture [Member]
Financing receivable modifications, number of contracts	3	0	3	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 56	$ 0	$ 56	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 56	$ 0	$ 56	$ 0
Consumer and Other [Member]
Financing receivable modifications, number of contracts	1	0	1	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 27	$ 0	$ 27	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 27	$ 0	$ 27	$ 0

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

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+ 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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