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Note 7 - Loans Receivable and Credit Disclosures - Composition of Loans Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021
Loans receivable	$ 1,249,091		$ 1,241,708
Less allowance for credit losses	(16,319)	$ (16,269)	(15,697)	$ (16,420)	$ (16,484)	$ (16,621)
Loans receivable, net	1,232,772		1,226,011
Construction Real Estate [Member]
Loans receivable	62,777		51,253
Less allowance for credit losses	(412)	(391)	(730)	(606)	(645)	(675)
Family Residential Real Estate 1-4 [Member]
Loans receivable	293,911		285,107
Less allowance for credit losses	(3,357)	(3,288)	(3,028)	(2,920)	(2,899)	(2,752)
Multifamily [Member]
Loans receivable	191,206		185,784
Less allowance for credit losses	(2,524)	(2,568)	(2,493)	(2,517)	(2,433)	(2,501)
Commercial Real Estate Portfolio Segment [Member]
Loans receivable	344,108		353,285
Less allowance for credit losses	(5,033)	(5,206)	(4,742)	(5,843)	(5,881)	(5,905)
Agriculture Real Estate [Member]
Loans receivable	158,683		159,448
Less allowance for credit losses	(1,214)	(1,218)	(1,625)	(1,692)	(1,630)	(1,584)
Commercial Portfolio Segment [Member]
Loans receivable	90,296		77,265
Less allowance for credit losses	(2,014)	(1,784)	(1,153)	(1,125)	(1,152)	(1,170)
Agriculture [Member]
Loans receivable	92,116		113,355
Less allowance for credit losses	(1,358)	(1,392)	(1,705)	(1,484)	(1,606)	(1,836)
Consumer and Other [Member]
Loans receivable	15,994		16,211
Less allowance for credit losses	$ (407)	$ (422)	$ (221)	$ (233)	$ (238)	$ (198)

X

- 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
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Reference 2: 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
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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
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-Section 45
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481990/310-10-45-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
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X

- Definition

Amortized cost, after allowance for credit loss, 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 946
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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