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Note 4 - Loans and the Allowance for Credit Losses - Loan Modifications (Details) - Extended Maturity [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Modified	$ 2,308		$ 7,953	$ 2,445
% of total segment financing receivables	0.15%		0.53%	0.24%
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Modified	$ 2,232	$ 2,357	$ 7,105	$ 2,413
% of total segment financing receivables	1.45%	1.93%	4.60%	1.98%
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Modified	$ 76		$ 848	$ 32
% of total segment financing receivables	0.01%		0.09%	0.04%

X

- Definition

Amortized cost excluding accrued interest, of financing receivable modified during period 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 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Percentage, excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty to total financing receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-42

+ Details

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- Details

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- Details

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- Details

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- Details

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