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Note 7 - Loans Receivable and Credit Disclosures - Allowance for Loan Losses Impairment Analysis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Individually evaluated for credit losses	$ 243		$ 95
Collectively evaluated for credit losses	15,875		15,602
Balance September 30, 2023	16,118	$ 16,319	15,697	$ 15,897	$ 16,420	$ 16,621
Construction Real Estate [Member]
Individually evaluated for credit losses	0		0
Collectively evaluated for credit losses	416		730
Balance September 30, 2023	416	412	730	604	606	675
Family Residential Real Estate 1-4 [Member]
Individually evaluated for credit losses	81		10
Collectively evaluated for credit losses	3,177		3,018
Balance September 30, 2023	3,258	3,357	3,028	3,007	2,920	2,752
Multifamily [Member]
Individually evaluated for credit losses	0		0
Collectively evaluated for credit losses	2,495		2,493
Balance September 30, 2023	2,495	2,524	2,493	2,310	2,517	2,501
Commercial Real Estate Portfolio Segment [Member]
Individually evaluated for credit losses	0		0
Collectively evaluated for credit losses	4,998		4,742
Balance September 30, 2023	4,998	5,033	4,742	5,559	5,843	5,905
Agriculture Real Estate [Member]
Individually evaluated for credit losses	0		0
Collectively evaluated for credit losses	1,229		1,625
Balance September 30, 2023	1,229	1,214	1,625	1,598	1,692	1,584
Commercial Portfolio Segment [Member]
Individually evaluated for credit losses	95		0
Collectively evaluated for credit losses	1,779		1,153
Balance September 30, 2023	1,874	2,014	1,153	1,099	1,125	1,170
Agriculture [Member]
Individually evaluated for credit losses	53		68
Collectively evaluated for credit losses	1,345		1,637
Balance September 30, 2023	1,398	1,358	1,705	1,501	1,484	1,836
Consumer and Other [Member]
Individually evaluated for credit losses	14		17
Collectively evaluated for credit losses	436		204
Balance September 30, 2023	$ 450	$ 407	$ 221	$ 219	$ 233	$ 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.

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- Definition

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

+ References

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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
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-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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-Name Accounting Standards Codification
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-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
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 13
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-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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