Note 5 - Loans and the Allowance for Credit Losses - Allocation of the Allowance for Credit Losses (Details) - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Loans, Balance	$ 13,196,000
Charge-offs	(1,095,000)	$ (2,039,000)
Loans, Balance	19,959,000	13,196,000
Loans, Net of Unfunded Commitments [Member]
Loans, Balance	13,196,000	12,867,000	$ 10,717,000
Charge-offs	(1,095,000)	(2,039,000)	(1,802,000)
Recoveries	653,000	993,000	848,000
Initial allowance on acquired PCD loans	315,000
Provision	6,890,000	1,375,000	2,575,000
Loans, Balance	19,959,000	13,196,000	12,867,000
Loans, Net of Unfunded Commitments [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			529,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member]
Loans, Balance	1,265,000	1,134,000	892,000
Charge-offs	(355,000)	(302,000)	(123,000)
Recoveries	38,000	25,000	44,000
Initial allowance on acquired PCD loans	58,000
Provision	2,240,000	408,000	(33,000)
Loans, Balance	3,246,000	1,265,000	1,134,000
Commercial Portfolio Segment [Member] \| Commercial Loans [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			354,000
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member]
Loans, Balance	1,802,000	1,738,000	1,086,000
Charge-offs	(11,000)	0	0
Recoveries	0	0	0
Initial allowance on acquired PCD loans	31,000
Provision	2,151,000	64,000	504,000
Loans, Balance	3,973,000	1,802,000	1,738,000
Commercial Portfolio Segment [Member] \| Agricultural Loans [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			148,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans, Balance	7,459,000	6,678,000	4,980,000
Charge-offs	0	0	0
Recoveries	7,000	1,000	1,000
Initial allowance on acquired PCD loans	226,000
Provision	2,913,000	780,000	209,000
Loans, Balance	10,605,000	7,459,000	6,678,000
Commercial Portfolio Segment [Member] \| Real Estate Loan [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			1,488,000
Commercial Portfolio Segment [Member] \| Construction Loans [Member]
Loans, Balance	815,000	797,000	1,500,000
Charge-offs	0	0	0
Recoveries	0	0	0
Initial allowance on acquired PCD loans	0
Provision	(301,000)	18,000	248,000
Loans, Balance	514,000	815,000	797,000
Commercial Portfolio Segment [Member] \| Construction Loans [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			(951,000)
Residential Portfolio Segment [Member] \| Real Estate Loan [Member]
Loans, Balance	102,000	137,000	138,000
Charge-offs	0	0	0
Recoveries	49,000	4,000	3,000
Initial allowance on acquired PCD loans	0
Provision	107,000	(39,000)	(6,000)
Loans, Balance	258,000	102,000	137,000
Residential Portfolio Segment [Member] \| Real Estate Loan [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			2,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member]
Loans, Balance	460,000	439,000	687,000
Charge-offs	(66,000)	0	0
Recoveries	0	0	0
Initial allowance on acquired PCD loans	0
Provision	108,000	21,000	173,000
Loans, Balance	502,000	460,000	439,000
Residential Portfolio Segment [Member] \| Equity Lines of Credit [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			(421,000)
Consumer Portfolio Segment [Member] \| Automobile Loan [Member]
Loans, Balance	1,215,000	1,865,000	1,289,000
Charge-offs	(528,000)	(1,643,000)	(1,550,000)
Recoveries	544,000	928,000	746,000
Initial allowance on acquired PCD loans	0
Provision	(640,000)	65,000	1,371,000
Loans, Balance	591,000	1,215,000	1,865,000
Consumer Portfolio Segment [Member] \| Automobile Loan [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			9,000
Consumer Portfolio Segment [Member] \| Other Loans [Member]
Loans, Balance	78,000	79,000	145,000
Charge-offs	(135,000)	(94,000)	(129,000)
Recoveries	15,000	35,000	54,000
Initial allowance on acquired PCD loans	0
Provision	312,000	58,000	109,000
Loans, Balance	$ 270,000	$ 78,000	79,000
Consumer Portfolio Segment [Member] \| Other Loans [Member] \| Accounting Standards Update 2016-13 [Member] \| Cumulative Effect, Period of Adoption, Adjustment [Member]
Loans, Balance			$ (100,000)

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
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-Section 45
-Paragraph 1
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-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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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
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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
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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