Note 3 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Non-recurring Basis (Details) - Fair Value, Nonrecurring [Member] - USD ($)	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024
Collateral dependent loans, fair value	$ 1,988
Collateral depended loans, total loss	1,487	$ 1
Collateral depended loans, total loss		50
Total	226
Total, total loss	0
Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0
Total	0
Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	0
Total	0
Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	1,988
Total	226
Commercial Loans [Member]
Collateral dependent loans, fair value	84	24
Collateral depended loans, total loss	39
Commercial Loans [Member] \| Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0	0
Commercial Loans [Member] \| Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	0	0
Commercial Loans [Member] \| Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	84	24
Agricultural Loans [Member]
Collateral dependent loans, fair value	1,904
Collateral depended loans, total loss	1,448
Agricultural Loans [Member] \| Fair Value, Inputs, Level 1 [Member]
Collateral dependent loans, fair value	0
Agricultural Loans [Member] \| Fair Value, Inputs, Level 2 [Member]
Collateral dependent loans, fair value	0
Agricultural Loans [Member] \| Fair Value, Inputs, Level 3 [Member]
Collateral dependent loans, fair value	1,904
Real Estate Loan [Member]
Collateral depended loans, total loss	0
Real Estate Loan [Member] \| Residential Portfolio Segment [Member]
RE – Residential, fair value	91	91
Real Estate Loan [Member] \| Fair Value, Inputs, Level 1 [Member]
RE – Residential, fair value	0	0
Real Estate Loan [Member] \| Fair Value, Inputs, Level 2 [Member]
RE – Residential, fair value	0	0
Real Estate Loan [Member] \| Fair Value, Inputs, Level 3 [Member]
RE – Residential, fair value	91	$ 91
Equity Lines of Credit [Member] \| Residential Portfolio Segment [Member]
Equity lines of credit, fair value	135
Equity lines of credit, total loss	0
Equity Lines of Credit [Member] \| Fair Value, Inputs, Level 1 [Member] \| Residential Portfolio Segment [Member]
Equity lines of credit, fair value
Equity Lines of Credit [Member] \| Fair Value, Inputs, Level 2 [Member] \| Residential Portfolio Segment [Member]
Equity lines of credit, fair value
Equity Lines of Credit [Member] \| Fair Value, Inputs, Level 3 [Member] \| Residential Portfolio Segment [Member]
Equity lines of credit, fair value	$ 135

Amount of fair value loss or gain for collateral dependent loans.

No definition available.

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- Definition

Represents fair value portion of impaired loans.

+ References

No definition available.

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- Definition

Fair value portion of other real estate.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of other real estate owned and receivables.

+ References

No definition available.

+ Details

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- Definition

Amount of fair value loss or gain for other real estate owned and receivables.

+ References

No definition available.

+ Details

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- Definition

Amount of fair value loss or gain for other real estate owned.

+ References

No definition available.

+ Details

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- Definition

Amount of fair value loss or gain for receivables.

+ References

No definition available.

+ Details

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- Definition

Fair value portion of receivables, including, but not limited to, trade account receivables, note receivables, and loan receivables.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E

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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