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Note 7 - Loans Receivable and Credit Disclosures - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Financing receivable modifications, number of contracts	0	3
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 211
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 211
Construction Real Estate [Member]
Financing receivable modifications, number of contracts	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0
Family Residential Real Estate 1-4 [Member]
Financing receivable modifications, number of contracts	0	2
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 153
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 153
Commercial Real Estate Portfolio Segment [Member]
Financing receivable modifications, number of contracts	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0
Agriculture Real Estate [Member]
Financing receivable modifications, number of contracts	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0
Commercial Portfolio Segment [Member]
Financing receivable modifications, number of contracts	0	1
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 58
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 58
Agriculture [Member]
Financing receivable modifications, number of contracts	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 0
Consumer and Other [Member]
Financing receivable modifications, number of contracts	0	0
Financing receivable modifications, pre-modification outstanding, recorded investment	$ 0	$ 0
Financing receivable modifications, post modification outstanding, recorded investment	$ 0	$ 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 https://asc.fasb.org/extlink&oid=123577603&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 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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