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Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans	$ 1,016,848	$ 1,069,668	$ 802,048
Nonaccrual	1,727	6,707
Agricultural [Member]
Loans	64,819	53,735	57,339
Nonaccrual	313	348
Agricultural [Member] | Pass [Member]
Loans	61,864	50,185
Agricultural [Member] | Special Mention [Member]
Loans	339	3,202
Agricultural [Member] | Substandard [Member]
Loans	2,616	348
Agricultural [Member] | Doubtful [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	35,174	34,014	38,854
Nonaccrual	0	8
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	35,174	34,006
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial and Industrial [Member]
Loans	203,024	303,527	148,083
Nonaccrual	285	1,802
Commercial and Industrial [Member] | Pass [Member]
Loans	201,202	294,614
Commercial and Industrial [Member] | Special Mention [Member]
Loans	300	4,101
Commercial and Industrial [Member] | Substandard [Member]
Loans	1,266	4,812
Commercial and Industrial [Member] | Doubtful [Member]
Loans	256	0
Construction Real Estate [Member]
Loans	19,066	16,639	13,411
Nonaccrual	0	80
Construction Real Estate [Member] | Performing Financial Instruments [Member]
Loans	19,066	16,559
Construction Real Estate [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	525,884	469,247	326,379
Nonaccrual	279	3,088
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	519,537	453,080
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans	778	6,006
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	5,569	8,925
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	0	1,236
Residential Portfolio Segment [Member]
Loans	168,881	192,506	$ 217,982
Nonaccrual	850	1,381
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	168,031	191,125
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	$ 0	$ 0

X

- Definition

Amount of financing receivable on nonaccrual status.

+ 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 http://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 http://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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-Paragraph 2
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524

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