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Note 9 - Fair Value Measurement - Quantitative Information About Level 3 Fair Value Measurements for Financial Instruments Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Collateral dependent loans, fair value	$ 1,204
Total, fair value	114
Commercial Loans [Member]
Collateral dependent loans, fair value	55	$ 24
Agricultural Loans [Member]
Collateral dependent loans, fair value	1,149
Real Estate Loan [Member] | Residential Portfolio Segment [Member]
RE – Residential, fair value	91	91
Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Equity lines of credit, fair value	23
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	1,204
Total, fair value	114
Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member]
Collateral dependent loans, fair value	55	24
Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member]
Collateral dependent loans, fair value	1,149
Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member]
RE – Residential, fair value	91	91
Fair Value, Inputs, Level 3 [Member] | Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Equity lines of credit, fair value	23
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	1,204	24
Total, fair value	114	91
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member]
Collateral dependent loans, fair value	$ 55	$ 24
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Minimum [Member]
Collateral dependent loans, measurement input	0.37
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Maximum [Member]
Collateral dependent loans, measurement input	1
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Commercial Loans [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
Collateral dependent loans, measurement input	0.78	0.53
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member]
Collateral dependent loans, fair value	$ 1,149	$ 0
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Minimum [Member]
Collateral dependent loans, measurement input	0.02
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Maximum [Member]
Collateral dependent loans, measurement input	0.98
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Agricultural Loans [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
Collateral dependent loans, measurement input	0.44
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member]
RE – Residential, fair value	$ 91	$ 91
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Real Estate Loan [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member]
Other Real Estate, measurement input	0.60	0.60
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Lines of Credit [Member] | Residential Portfolio Segment [Member]
Equity lines of credit, fair value	$ 23	$ 0
Third Party Appraisals [Member] | Fair Value, Inputs, Level 3 [Member] | Equity Lines of Credit [Member] | Measurement Input, Manager Adjustments [Member] | Weighted Average [Member] | Residential Portfolio Segment [Member]
Equity lines of credit, measurement input	0.55

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- Definition

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+ References

No definition available.

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- Definition

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+ References

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- Definition

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+ References

No definition available.

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- Definition

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+ References

No definition available.

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
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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
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

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