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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Number of loans	1	0	8	3
Pre- Modification Outstanding	$ 493	$ 0	$ 3,141	$ 1,733
Post- Modification Outstanding	$ 493	$ 0	$ 3,141	$ 1,733
Agricultural [Member]
Number of loans	0	0	6	1
Pre- Modification Outstanding	$ 0	$ 0	$ 2,210	$ 67
Post- Modification Outstanding	$ 0	$ 0	$ 2,210	$ 67
Commercial Real Estate Portfolio Segment [Member]
Number of loans	1	0	2	2
Pre- Modification Outstanding	$ 493	$ 0	$ 931	$ 1,666
Post- Modification Outstanding	$ 493	$ 0	$ 931	$ 1,666
Financial Asset, 30 Days Past Due or More [Member]
Number of loans		3		3
Recorded investment		$ 1,733		$ 1,733
Financial Asset, 30 Days Past Due or More [Member] | Agricultural [Member]
Number of loans		1		1
Recorded investment		$ 67		$ 67
Financial Asset, 30 Days Past Due or More [Member] | Commercial Real Estate Portfolio Segment [Member]
Number of loans		2		2
Recorded investment		$ 1,666		$ 1,666

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=123577603&loc=SL6953676-111524

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X

- 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=123577603&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=123577603&loc=SL6953676-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring.

+ 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=123577603&loc=SL6953676-111524

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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