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Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Loans	$ 1,027,406	$ 1,016,848	$ 1,035,083
Nonaccrual	1,167	1,727
Agricultural [Member]
Loans	61,618	64,819	46,686
Nonaccrual	314	313
Agricultural [Member] | Pass [Member]
Loans	58,749	61,864
Agricultural [Member] | Special Mention [Member]
Loans	327	339
Agricultural [Member] | Substandard [Member]
Loans	2,542	2,616
Agricultural [Member] | Doubtful [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	36,151	35,174	32,330
Nonaccrual	32	0
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	36,119	35,174
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial and Industrial [Member]
Loans	198,914	203,024	298,050
Nonaccrual	205	285
Commercial and Industrial [Member] | Pass [Member]
Loans	196,394	201,202
Commercial and Industrial [Member] | Special Mention [Member]
Loans	1,190	300
Commercial and Industrial [Member] | Substandard [Member]
Loans	1,245	1,266
Commercial and Industrial [Member] | Doubtful [Member]
Loans	85	256
Construction Real Estate [Member]
Loans	15,669	19,066	15,670
Nonaccrual	0	0
Construction Real Estate [Member] | Performing Financial Instruments [Member]
Loans	15,669	19,066
Construction Real Estate [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	537,252	525,884	462,421
Nonaccrual	0	279
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	531,683	519,537
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans	749	778
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	4,820	5,569
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	0	0
Residential Portfolio Segment [Member]
Loans	177,802	168,881	$ 179,926
Nonaccrual	616	850
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	177,186	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
-Subparagraph (a)
-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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-Topic 310
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Section 50
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-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

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