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Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Loans	$ 1,035,083	$ 1,069,668	$ 811,577
Nonaccrual	5,173	6,707
Agricultural [Member]
Loans	46,686	53,735	50,483
Nonaccrual	348	348
Agricultural [Member] | Pass [Member]
Loans	43,145	50,185
Agricultural [Member] | Special Mention [Member]
Loans	368	3,202
Agricultural [Member] | Substandard [Member]
Loans	3,173	348
Agricultural [Member] | Doubtful [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	32,330	34,014	34,252
Nonaccrual	0	8
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	32,330	34,006
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial and Industrial [Member]
Loans	298,050	303,527	141,201
Nonaccrual	1,699	1,802
Commercial and Industrial [Member] | Pass [Member]
Loans	289,781	294,614
Commercial and Industrial [Member] | Special Mention [Member]
Loans	2,109	4,101
Commercial and Industrial [Member] | Substandard [Member]
Loans	6,160	4,812
Commercial and Industrial [Member] | Doubtful [Member]
Loans	0	0
Construction Real Estate [Member]
Loans	15,670	16,639	17,525
Nonaccrual	0	80
Construction Real Estate [Member] | Performing Financial Instruments [Member]
Loans	15,670	16,559
Construction Real Estate [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	462,421	469,247	351,753
Nonaccrual	1,850	3,088
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	449,666	453,080
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans	3,674	6,006
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	9,081	8,925
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	0	1,236
Residential Portfolio Segment [Member]
Loans	179,926	192,506	$ 216,363
Nonaccrual	1,276	1,381
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	178,650	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=121611835&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=121599337&loc=SL82919258-210447

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- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 310
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-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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