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Note 6 - Loans Receivable and Credit Disclosures - Composition of Loans Receivable (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Loans receivable		$ 1,293,568		$ 1,320,813
Unallocated portfolio layer basis adjustments1	[1]	176		162
Less allowance for credit losses		(17,950)	$ (16,971)	(17,058)	$ (17,562)	$ (17,203)	$ (16,776)
Loans receivable, net		1,275,794		1,303,917
Construction Real Estate [Member]
Loans receivable		57,966		59,281
Less allowance for credit losses		(492)	(481)	(482)	(564)	(413)	(408)
Family Residential Real Estate 1-4 [Member]
Loans receivable		315,827		309,704
Less allowance for credit losses		(4,106)	(3,880)	(3,890)	(3,750)	(3,349)	(3,333)
Multifamily [Member]
Loans receivable		209,099		200,209
Less allowance for credit losses		(2,266)	(2,221)	(2,188)	(2,211)	(2,584)	(2,542)
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		315,952		350,493
Less allowance for credit losses		(5,255)	(4,508)	(4,932)	(5,009)	(5,530)	(5,236)
Agriculture Real Estate [Member]
Loans receivable		158,075		159,880
Less allowance for credit losses		(1,563)	(1,573)	(1,584)	(1,559)	(1,226)	(1,238)
Commercial Portfolio Segment [Member]
Loans receivable		94,777		90,023
Less allowance for credit losses		(2,085)	(1,888)	(1,759)	(2,323)	(1,912)	(1,955)
Agriculture [Member]
Loans receivable		126,051		134,157
Less allowance for credit losses		(1,809)	(1,991)	(1,805)	(1,715)	(1,710)	(1,607)
Consumer and Other [Member]
Loans receivable		15,821		17,066
Less allowance for credit losses		$ (374)	$ (429)	$ (418)	$ (431)	$ (479)	$ (457)
[1] This amount represents portfolio layer method basis adjustments related to loans hedged in a closed portfolio. Under the portfolio layer method basis adjustments are not allocated to individual loans, however, the amounts impact the net loan balance. These basis adjustments would be allocated to the amortized cost of specific loans within the pool if the hedge was de-designated. See Note 11 (“Derivative Financial Instruments”) for additional information.

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- Definition

Amount of unallocated portfolio layer basis adjustment of financing receivable.

+ References

No definition available.

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- 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

Amortized cost excluding accrued interest, after allowance for credit loss, of 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

Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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/1943274/2147478546/942-210-S99-1

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