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Note 7 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans receivable	$ 1,240,314	$ 1,241,708
Financing receivable, recorded investment, 90 days past due and still accruing	305	0
Construction Real Estate [Member]
Loans receivable	59,756	51,253
Financing receivable, recorded investment, 90 days past due and still accruing	305	0
Family Residential Real Estate 1-4 [Member]
Loans receivable	286,418	285,107
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Multifamily [Member]
Loans receivable	193,566	185,784
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	350,999	353,285
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Agriculture Real Estate [Member]
Loans receivable	158,337	159,448
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Commercial Portfolio Segment [Member]
Loans receivable	82,345	77,265
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Agriculture [Member]
Loans receivable	92,402	113,355
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Consumer and Other [Member]
Loans receivable	16,491	16,211
Financing receivable, recorded investment, 90 days past due and still accruing	0	0
Financing Receivables 30 to 89 Days Past Due [Member]
Loans receivable	2,554	4,404
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable	66	66
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable	420	944
Financing Receivables 30 to 89 Days Past Due [Member] | Multifamily [Member]
Loans receivable	1,290	0
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	107	2,362
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable	119	185
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	337	592
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Loans receivable	205	218
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable	10	37
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable	305	1,451
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable	305	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable	0	11
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Multifamily [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	0	1,399
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable	0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	0	7
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Loans receivable	0	30
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable	0	4
Financial Asset, Past Due [Member]
Loans receivable	2,859	5,855
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Loans receivable	371	66
Financial Asset, Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable	420	955
Financial Asset, Past Due [Member] | Multifamily [Member]
Loans receivable	1,290	0
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	107	3,761
Financial Asset, Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable	119	185
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	337	599
Financial Asset, Past Due [Member] | Agriculture [Member]
Loans receivable	205	248
Financial Asset, Past Due [Member] | Consumer and Other [Member]
Loans receivable	10	41
Financial Asset, Not Past Due [Member]
Loans receivable	1,237,455	1,235,853
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans receivable	59,385	51,187
Financial Asset, Not Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable	285,998	284,152
Financial Asset, Not Past Due [Member] | Multifamily [Member]
Loans receivable	192,276	185,784
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable	350,892	349,524
Financial Asset, Not Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable	158,218	159,263
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable	82,008	76,666
Financial Asset, Not Past Due [Member] | Agriculture [Member]
Loans receivable	92,197	113,107
Financial Asset, Not Past Due [Member] | Consumer and Other [Member]
Loans receivable	$ 16,481	$ 16,170

X

- Definition

Amortized cost, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-5

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: 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))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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X

- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 80
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479294/326-20-55-80

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph 16
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-16

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 310
-Publisher FASB
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