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Note 3 - Loans and Allowance for Loan Losses - Credit Risk Profile (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019	Sep. 30, 2019
Loans	$ 1,078,796	$ 802,048	$ 406,806
Nonaccrual	5,081	4,687
Agricultural [Member]
Loans	53,503	57,339	50,057
Nonaccrual	373	379
Agricultural [Member] | Pass [Member]
Loans	49,855	55,866
Agricultural [Member] | Special Mention [Member]
Loans	3,275	1,094
Agricultural [Member] | Substandard [Member]
Loans	373	379
Agricultural [Member] | Doubtful [Member]
Loans	0	0
Consumer Portfolio Segment [Member]
Loans	34,153	38,854	24,408
Nonaccrual	19	16
Consumer Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	34,134	38,838
Consumer Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial and Industrial [Member]
Loans	306,120	148,083	81,531
Nonaccrual	727	776
Commercial and Industrial [Member] | Pass [Member]
Loans	293,858	146,728
Commercial and Industrial [Member] | Special Mention [Member]
Loans	4,526	1,081
Commercial and Industrial [Member] | Substandard [Member]
Loans	7,736	274
Commercial and Industrial [Member] | Doubtful [Member]
Loans	0	0
Construction Real Estate [Member]
Loans	16,489	13,411	11,188
Nonaccrual	0	0
Construction Real Estate [Member] | Performing Financial Instruments [Member]
Loans	16,489	13,411
Construction Real Estate [Member] | Nonperforming Financial Instruments [Member]
Loans	0	0
Commercial Real Estate Portfolio Segment [Member]
Loans	463,306	326,379	144,306
Nonaccrual	3,186	2,185
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Loans	448,053	322,105
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Loans	5,275	1,332
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Loans	8,505	2,942
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Loans	1,473	0
Residential Portfolio Segment [Member]
Loans	205,225	217,982	$ 95,316
Nonaccrual	775	1,331
Residential Portfolio Segment [Member] | Performing Financial Instruments [Member]
Loans	204,293	216,651
Residential Portfolio Segment [Member] | Nonperforming Financial Instruments [Member]
Loans	$ 157	$ 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
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-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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-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524

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