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Note 3 - Loans and Allowance for Loan Losses - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Number of loans	1	7
Pre- Modification Outstanding	$ 258	$ 3,284
Post- Modification Outstanding	$ 258	$ 3,284
Financial Asset, 30 Days Past Due or More [Member]
Number of loans		4
Recorded investment		$ 1,902
Commercial and Industrial [Member] | Financial Asset, 30 Days Past Due or More [Member]
Number of loans		1
Recorded investment		$ 52
Commercial Real Estate Portfolio Segment [Member]
Number of loans		1
Pre- Modification Outstanding		$ 958
Post- Modification Outstanding		$ 958
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 Days Past Due or More [Member]
Number of loans		3
Recorded investment		$ 1,850
Agricultural [Member]
Number of loans	1	6
Pre- Modification Outstanding	$ 258	$ 2,326
Post- Modification Outstanding	$ 258	$ 2,326

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 https://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 https://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 https://asc.fasb.org/extlink&oid=123577603&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 https://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 https://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554

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