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Note 8 - Loans Receivable and Credit Disclosures - Loans Receivable Impairment Analysis (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Individually evaluated for impairment		$ 16,388	$ 4,788
Collectively evaluated for impairment		1,160,711	1,056,058
Balance		1,177,099	1,060,846
Construction Real Estate [Member]
Individually evaluated for impairment		165	0
Collectively evaluated for impairment		45,356	47,895
Balance		45,521	47,895
Family Residential Real Estate 1-4 [Member]
Individually evaluated for impairment		1,332	1,204
Collectively evaluated for impairment		209,907	200,306
Balance		211,239	201,510
Commercial Real Estate Portfolio Segment [Member]
Individually evaluated for impairment		11,046	83
Collectively evaluated for impairment		480,353	435,767
Balance		491,399	435,850
Agriculture Real Estate [Member]
Individually evaluated for impairment		1,868	84
Collectively evaluated for impairment		155,627	160,687
Balance		157,495	160,771
Commercial Portfolio Segment [Member]
Individually evaluated for impairment		949	462
Collectively evaluated for impairment		151,758	83,622
Balance	[1]	152,707	84,084
Agriculture [Member]
Individually evaluated for impairment		977	2,951
Collectively evaluated for impairment		101,222	108,994
Balance		102,199	111,945
Consumer and Other [Member]
Individually evaluated for impairment		51	4
Collectively evaluated for impairment		16,488	18,787
Balance		$ 16,539	$ 18,791
[1] Commercial loan portfolio as of September 30, 2020 includes $79.6 million Payroll Protection Program ("PPP") loans

X

- Definition

The balance of financing receivables that were collectively evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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- Definition

The balance of financing receivables that were individually evaluated for impairment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (h)
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- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. 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

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