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Note 7 - Loans Receivable and Credit Disclosures - Activity in Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2023		Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance	$ 16,269		$ 16,484	$ 15,697	$ 16,621
Credit loss expense (benefit) for loans	73	[1]	(59)	285	(186)
Recoveries of loans charged-off	10		8	20	11
Loans charged-off	(33)		(13)	(201)	(26)
Balance	16,319		16,420	16,319	16,420
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				518
Construction Real Estate [Member]
Balance	391		645	730	675
Credit loss expense (benefit) for loans	21	[1]	(39)	77	(69)
Recoveries of loans charged-off	0		0	0	0
Loans charged-off	0		0	0	0
Balance	412		606	412	606
Construction Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				(395)
Family Residential Real Estate 1-4 [Member]
Balance	3,288		2,899	3,028	2,752
Credit loss expense (benefit) for loans	68	[1]	24	85	174
Recoveries of loans charged-off	1		3	2	4
Loans charged-off	0		(6)	0	(10)
Balance	3,357		2,920	3,357	2,920
Family Residential Real Estate 1-4 [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				242
Multifamily [Member]
Balance	2,568		2,433	2,493	2,501
Credit loss expense (benefit) for loans	(44)	[1]	84	55	16
Recoveries of loans charged-off	0		0	0	0
Loans charged-off	0		0	0	0
Balance	2,524		2,517	2,524	2,517
Multifamily [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				(24)
Commercial Real Estate Portfolio Segment [Member]
Balance	5,206		5,881	4,742	5,905
Credit loss expense (benefit) for loans	(173)	[1]	(39)	(227)	(63)
Recoveries of loans charged-off	0		1	5	1
Loans charged-off	0		0	0	0
Balance	5,033		5,843	5,033	5,843
Commercial Real Estate Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				513
Agriculture Real Estate [Member]
Balance	1,218		1,630	1,625	1,584
Credit loss expense (benefit) for loans	(4)	[1]	62	(13)	108
Recoveries of loans charged-off	0		0	0	0
Loans charged-off	0		0	0	0
Balance	1,214		1,692	1,214	1,692
Agriculture Real Estate [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				(398)
Commercial Portfolio Segment [Member]
Balance	1,784		1,152	1,153	1,170
Credit loss expense (benefit) for loans	260	[1]	(28)	443	(47)
Recoveries of loans charged-off	3		1	6	2
Loans charged-off	(33)		0	(37)	0
Balance	2,014		1,125	2,014	1,125
Commercial Portfolio Segment [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				449
Agriculture [Member]
Balance	1,392		1,606	1,705	1,836
Credit loss expense (benefit) for loans	(34)	[1]	(122)	(122)	(352)
Recoveries of loans charged-off	0		0	0	0
Loans charged-off	0		0	(164)	0
Balance	1,358		1,484	1,358	1,484
Agriculture [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				(61)
Consumer and Other [Member]
Balance	422		238	221	198
Credit loss expense (benefit) for loans	(21)	[1]	(1)	(13)	47
Recoveries of loans charged-off	6		3	7	4
Loans charged-off	0		(7)	0	(16)
Balance	$ 407		$ 233	407	$ 233
Consumer and Other [Member] | Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance				$ 192
[1] The difference in the credit loss expense reported herein as compared to the Consolidated Statements of Income is associated with the credit loss expense of $63 thousand related to off-balance sheet credit exposures.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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