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Note 4 - Loans and the Allowance for Credit Losses - Allocation of the Allowance for Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Loans, Balance			$ 13,196
Charge-offs			(730)		$ (2,039)
Loans, Balance	$ 19,564		19,564		13,196
Loans, Net of Unfunded Commitments [Member]
Loans, Balance	14,209	$ 14,082	13,196	$ 12,867	12,867
Charge-offs	(224)	(412)	(730)	(1,422)
Recoveries	141	286	511	686
Initial allowance on acquired PCD loans	315		315
Provision for (recovery of) credit losses	5,123	(350)	6,272	1,475
Loans, Balance	19,564	13,606	19,564	13,606	13,196
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans, Balance	1,397	1,426	1,265	1,134	1,134
Charge-offs	(25)	0	(190)	(65)	(302)
Recoveries	11	6	22	21
Initial allowance on acquired PCD loans	58		58
Provision for (recovery of) credit losses	1,035	(73)	1,321	269
Loans, Balance	2,476	1,359	2,476	1,359	1,265
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans, Balance	2,657	1,780	1,802	1,738	1,738
Charge-offs	0	0	(11)	0	0
Recoveries	0	0	0	0
Initial allowance on acquired PCD loans	31		31
Provision for (recovery of) credit losses	568	(10)	1,434	32
Loans, Balance	3,256	1,770	3,256	1,770	1,802
Commercial Portfolio Segment [Member] | Real Estate Loan [Member]
Loans, Balance	7,742	7,581	7,459	6,678	6,678
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Initial allowance on acquired PCD loans	226		226
Provision for (recovery of) credit losses	3,111	(73)	3,394	830
Loans, Balance	11,079	7,508	11,079	7,508	7,459
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Loans, Balance	694	973	815	797	797
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Initial allowance on acquired PCD loans	0		0
Provision for (recovery of) credit losses	32	(125)	(89)	51
Loans, Balance	726	848	726	848	815
Residential Portfolio Segment [Member] | Real Estate Loan [Member]
Loans, Balance	110	121	102	137	137
Charge-offs	0	0	0	0	0
Recoveries	47	1	49	3
Initial allowance on acquired PCD loans	0		0
Provision for (recovery of) credit losses	108	(12)	114	(30)
Loans, Balance	265	110	265	110	102
Residential Portfolio Segment [Member] | Equity Lines of Credit [Member]
Loans, Balance	562	458	460	439	439
Charge-offs	(19)	0	(19)	0	0
Recoveries	0	0	0	0
Initial allowance on acquired PCD loans	0		0
Provision for (recovery of) credit losses	57	(2)	159	17
Loans, Balance	600	456	600	456	460
Consumer Portfolio Segment [Member] | Automobile Loan [Member]
Loans, Balance	955	1,654	1,215	1,865	1,865
Charge-offs	(157)	(396)	(408)	(1,292)	(1,643)
Recoveries	80	266	430	642
Initial allowance on acquired PCD loans	0		0
Provision for (recovery of) credit losses	(39)	(56)	(398)	253
Loans, Balance	839	1,468	839	1,468	1,215
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans, Balance	92	89	78	79	79
Charge-offs	(23)	(16)	(102)	(65)	(94)
Recoveries	3	13	10	20
Initial allowance on acquired PCD loans	0		0
Provision for (recovery of) credit losses	251	1	337	53
Loans, Balance	$ 323	$ 87	$ 323	$ 87	$ 78

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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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 19
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-19

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