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Note 7 - Loans Receivable and Credit Disclosures - Composition of Loans Receivable (Details) - USD ($) $ in Thousands		Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Loans receivable		$ 1,248,108		$ 1,241,708
Unallocated portfolio layer basis adjustments1	[1]	(97)		0
Less allowance for credit losses		(16,118)	$ (16,319)	(15,697)	$ (15,897)	$ (16,420)	$ (16,621)
Loans receivable, net		1,231,893		1,226,011
Construction Real Estate [Member]
Loans receivable		64,734		51,253
Less allowance for credit losses		(416)	(412)	(730)	(604)	(606)	(675)
Family Residential Real Estate 1-4 [Member]
Loans receivable		280,443		285,107
Less allowance for credit losses		(3,258)	(3,357)	(3,028)	(3,007)	(2,920)	(2,752)
Multifamily [Member]
Loans receivable		193,197		185,784
Less allowance for credit losses		(2,495)	(2,524)	(2,493)	(2,310)	(2,517)	(2,501)
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		345,647		353,285
Less allowance for credit losses		(4,998)	(5,033)	(4,742)	(5,559)	(5,843)	(5,905)
Agriculture Real Estate [Member]
Loans receivable		161,963		159,448
Less allowance for credit losses		(1,229)	(1,214)	(1,625)	(1,598)	(1,692)	(1,584)
Commercial Portfolio Segment [Member]
Loans receivable		87,004		77,265
Less allowance for credit losses		(1,874)	(2,014)	(1,153)	(1,099)	(1,125)	(1,170)
Agriculture [Member]
Loans receivable		98,820		113,355
Less allowance for credit losses		(1,398)	(1,358)	(1,705)	(1,501)	(1,484)	(1,836)
Consumer and Other [Member]
Loans receivable		16,300		16,211
Less allowance for credit losses		$ (450)	$ (407)	$ (221)	$ (219)	$ (233)	$ (198)
[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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