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Note 6 - Loans Receivable and Credit Disclosures - Amortized Cost Basis of Collateral Dependent Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Allowance for credit loss	$ 17,950	$ 16,971	$ 17,058	$ 17,562	$ 17,203	$ 16,776
Construction Real Estate [Member]
Allowance for credit loss	492	481	482	564	413	408
Family Residential Real Estate 1-4 [Member]
Allowance for credit loss	4,106	3,880	3,890	3,750	3,349	3,333
Multifamily [Member]
Allowance for credit loss	2,266	2,221	2,188	2,211	2,584	2,542
Commercial Real Estate Portfolio Segment [Member]
Allowance for credit loss	5,255	4,508	4,932	5,009	5,530	5,236
Agriculture Real Estate [Member]
Allowance for credit loss	1,563	1,573	1,584	1,559	1,226	1,238
Commercial Portfolio Segment [Member]
Allowance for credit loss	2,085	1,888	1,759	2,323	1,912	1,955
Agriculture [Member]
Allowance for credit loss	1,809	1,991	1,805	1,715	1,710	1,607
Consumer and Other [Member]
Allowance for credit loss	374	$ 429	418	$ 431	$ 479	$ 457
Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	17,987		13,583
Real Estate [Member] | Construction Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	0		62
Real Estate [Member] | Family Residential Real Estate 1-4 [Member]
Financing Receivable Individually Evaluated For Impairment	1,267		696
Real Estate [Member] | Multifamily [Member]
Financing Receivable Individually Evaluated For Impairment	900		947
Real Estate [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	13,555		10,785
Real Estate [Member] | Agriculture Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	538		420
Real Estate [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	413		460
Real Estate [Member] | Agriculture [Member]
Financing Receivable Individually Evaluated For Impairment	1,314		213
Real Estate [Member] | Consumer and Other [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member]
Financing Receivable Individually Evaluated For Impairment	403		398
Equipment [Member] | Construction Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member] | Family Residential Real Estate 1-4 [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member] | Multifamily [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member] | Agriculture Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	403		398
Equipment [Member] | Agriculture [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Equipment [Member] | Consumer and Other [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Other [Member]
Financing Receivable Individually Evaluated For Impairment	938		765
Other [Member] | Construction Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Other [Member] | Family Residential Real Estate 1-4 [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Other [Member] | Multifamily [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Other [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Other [Member] | Agriculture Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	0		0
Other [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	642		405
Other [Member] | Agriculture [Member]
Financing Receivable Individually Evaluated For Impairment	296		357
Other [Member] | Consumer and Other [Member]
Financing Receivable Individually Evaluated For Impairment	0		3
Collateral Pledged [Member]
Financing Receivable Individually Evaluated For Impairment	19,328		14,746
Allowance for credit loss	1,385		90
Collateral Pledged [Member] | Construction Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	0		62
Allowance for credit loss	0		0
Collateral Pledged [Member] | Family Residential Real Estate 1-4 [Member]
Financing Receivable Individually Evaluated For Impairment	1,267		696
Allowance for credit loss	197		40
Collateral Pledged [Member] | Multifamily [Member]
Financing Receivable Individually Evaluated For Impairment	900		947
Allowance for credit loss	0		0
Collateral Pledged [Member] | Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	13,555		10,785
Allowance for credit loss	870		0
Collateral Pledged [Member] | Agriculture Real Estate [Member]
Financing Receivable Individually Evaluated For Impairment	538		420
Allowance for credit loss	0		0
Collateral Pledged [Member] | Commercial Portfolio Segment [Member]
Financing Receivable Individually Evaluated For Impairment	1,458		1,263
Allowance for credit loss	318		50
Collateral Pledged [Member] | Agriculture [Member]
Financing Receivable Individually Evaluated For Impairment	1,610		570
Allowance for credit loss	0		0
Collateral Pledged [Member] | Consumer and Other [Member]
Financing Receivable Individually Evaluated For Impairment	0		3
Allowance for credit loss	$ 0		$ 0

X

- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-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

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- Definition

Amount of financing receivable individually evaluated for credit loss. Excludes financing receivable collectively evaluated for credit loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 4
-Subparagraph (SAB Topic 6.L.5.a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480418/310-10-S99-4

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11C
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-11C

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