Note 5 - Loans and the Allowance for Credit Losses (Details Textual)	12 Months Ended
Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Deferred Loan Origination Costs	$ 3,031,000	$ 2,697,000	$ 2,283,000
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default		4,300,000	$ 0
Commercial Loans [Member]
Financing Receivable, Nonaccrual	152,000	55,000
Financing Receivable, Allowance for Credit Loss, Nonaccrual Loans	68,000	29,000
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default	$ 73,000	$ 30,000
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default, Number of Loans	1	1
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default, Period Past Due (Day)	44 days	70 days
Agricultural Loans [Member]
Financing Receivable, Nonaccrual	$ 3,352,000
Financing Receivable, Allowance for Credit Loss, Nonaccrual Loans	1,448,000
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default	6,900
Nonaccrual, Interest Income, Cash Basis Method [Member]
Financing Receivable, Nonaccrual, Interest Income	0	$ 0
Agricultural Loans 1 [Member]
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default	$ 4,900,000
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default, Number of Loans	4
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default, Period Past Due (Day)	199 days
Agricultural Loans 2 [Member]
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default	$ 2,000,000
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default, Number of Loans	1
Financing Receivable, Excluding Accrued Interest, Modified, Subsequent Default, Period Past Due (Day)	260 days

This item represents loan origination costs that have been deferred.

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

Number of loans, excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

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- Definition

Period past due of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

No definition available.

+ Details

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- Definition

Amortized cost excluding accrued interest, of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 44
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-44

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- Definition

Amount of interest income on financing receivable on nonaccrual status.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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