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Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Loans	$ 1,132,401	$ 1,016,848	$ 988,357
Nonaccrual	1,197	1,727
Agricultural [Member]
Loans	63,347	64,819	63,445
Nonaccrual	307	313
Agricultural [Member] | Pass [Member]
Loans	62,733	61,864
Agricultural [Member] | Special Mention [Member]
Loans	302	339
Agricultural [Member] | Substandard [Member]
Loans	312	2,616
Agricultural [Member] | Doubtful [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	38,356	35,174	33,806
Nonaccrual	7	0
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	38,349	35,174
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial and Industrial [Member]
Loans	208,590	203,024	217,242
Nonaccrual	46	285
Commercial and Industrial [Member] | Pass [Member]
Loans	208,087	201,202
Commercial and Industrial [Member] | Special Mention [Member]
Loans	344	300
Commercial and Industrial [Member] | Substandard [Member]
Loans	159	1,266
Commercial and Industrial [Member] | Doubtful [Member]
Loans	0	256
Construction Real Estate [Member]
Loans	14,299	19,066	18,238
Nonaccrual	0	0
Construction Real Estate [Member] | Performing Financial Instruments [Member]
Loans	14,299	19,066
Construction Real Estate [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	593,195	525,884	485,332
Nonaccrual	0	279
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	588,066	519,537
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans	729	778
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	4,400	5,569
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Residential Portfolio Segment [Member]
Loans	214,614	168,881	$ 170,294
Nonaccrual	837	850
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	213,777	168,031
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	$ 0	$ 0

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

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X

- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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