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Note 7 - Loans Receivable and Credit Disclosures - Composition of Loans Receivable (Details) - USD ($) $ in Thousands		Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Loans receivable		$ 1,312,873		$ 1,294,178
Unallocated portfolio layer basis adjustments1	[1]	462		410
Less allowance for credit losses		(17,562)	$ (17,203)	(16,776)	$ (16,118)	$ (16,319)	$ (15,697)
Loans receivable, net		1,295,773		1,277,812
Construction Real Estate [Member]
Loans receivable		65,812		63,050
Less allowance for credit losses		(564)	(413)	(408)	(416)	(412)	(730)
Family Residential Real Estate 1-4 [Member]
Loans receivable		297,331		289,404
Less allowance for credit losses		(3,750)	(3,349)	(3,333)	(3,258)	(3,357)	(3,028)
Multifamily [Member]
Loans receivable		201,888		195,536
Less allowance for credit losses		(2,211)	(2,584)	(2,542)	(2,495)	(2,524)	(2,493)
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		355,073		359,266
Less allowance for credit losses		(5,009)	(5,530)	(5,236)	(4,998)	(5,033)	(4,742)
Agriculture Real Estate [Member]
Loans receivable		157,914		161,517
Less allowance for credit losses		(1,559)	(1,226)	(1,238)	(1,229)	(1,214)	(1,625)
Commercial Portfolio Segment [Member]
Loans receivable		93,534		89,729
Less allowance for credit losses		(2,323)	(1,912)	(1,955)	(1,874)	(2,014)	(1,153)
Agriculture [Member]
Loans receivable		124,207		119,136
Less allowance for credit losses		(1,715)	(1,710)	(1,607)	(1,398)	(1,358)	(1,705)
Consumer and Other [Member]
Loans receivable		17,114		16,540
Less allowance for credit losses		$ (431)	$ (479)	$ (457)	$ (450)	$ (407)	$ (221)
[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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