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Note 4 - Loans Receivable and Credit Disclosures - Allowance for Loan Losses Impairment Analysis (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Ending ACL balance: Individually evaluated for credit losses		$ 95
Ending ACL balance: Collectively evaluated for credit losses		15,602
Ending ACL balance	$ 16,776	15,697	$ 16,621
Construction Real Estate [Member]
Ending ACL balance: Individually evaluated for credit losses		0
Ending ACL balance: Collectively evaluated for credit losses		730
Ending ACL balance	408	730	675
Family Residential Real Estate 1-4 [Member]
Ending ACL balance: Individually evaluated for credit losses		10
Ending ACL balance: Collectively evaluated for credit losses		3,018
Ending ACL balance	3,333	3,028	2,752
Multifamily [Member]
Ending ACL balance: Individually evaluated for credit losses		0
Ending ACL balance: Collectively evaluated for credit losses		2,493
Ending ACL balance	2,542	2,493	2,501
Commercial Real Estate Portfolio Segment [Member]
Ending ACL balance: Individually evaluated for credit losses		0
Ending ACL balance: Collectively evaluated for credit losses		4,742
Ending ACL balance	5,236	4,742	5,905
Agriculture Real Estate [Member]
Ending ACL balance: Individually evaluated for credit losses		0
Ending ACL balance: Collectively evaluated for credit losses		1,625
Ending ACL balance	1,238	1,625	1,584
Commercial Portfolio Segment [Member]
Ending ACL balance: Individually evaluated for credit losses		0
Ending ACL balance: Collectively evaluated for credit losses		1,153
Ending ACL balance	1,955	1,153	1,170
Agriculture [Member]
Ending ACL balance: Individually evaluated for credit losses		68
Ending ACL balance: Collectively evaluated for credit losses		1,637
Ending ACL balance	1,607	1,705	1,836
Consumer and Other [Member]
Ending ACL balance: Individually evaluated for credit losses		17
Ending ACL balance: Collectively evaluated for credit losses		204
Ending ACL balance	$ 457	$ 221	$ 198

X

- Definition

The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

+ References

No definition available.

+ Details

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X

- Definition

Amount of calculation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

+ References

No definition available.

+ Details

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- Definition

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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-Section 1405
-Paragraph (a)
-Subparagraph (1)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
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-Subparagraph (3)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (c)
-Publisher SEC

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479344/326-20-45-1

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(2))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-11B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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