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Note 5 - Loans Receivable and Credit Disclosures - Loans Receivable Impairment Analysis (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Ending balance: Individually evaluated for impairment		$ 15,273	$ 4,788
Ending balance: Collectively evaluated for impairment		1,132,304	1,056,058
Ending balance		1,147,577	1,060,846
Construction Real Estate [Member]
Ending balance: Individually evaluated for impairment		167	0
Ending balance: Collectively evaluated for impairment		45,330	47,895
Ending balance		45,497	47,895
Family Residential Real Estate 1-4 [Member]
Ending balance: Individually evaluated for impairment		1,340	1,204
Ending balance: Collectively evaluated for impairment		212,222	200,306
Ending balance		213,562	201,510
Commercial Real Estate Portfolio Segment [Member]
Ending balance: Individually evaluated for impairment		10,258	83
Ending balance: Collectively evaluated for impairment		486,099	435,767
Ending balance		496,357	435,850
Agriculture Real Estate [Member]
Ending balance: Individually evaluated for impairment		1,664	84
Ending balance: Collectively evaluated for impairment		150,328	160,687
Ending balance		151,992	160,771
Commercial Portfolio Segment [Member]
Ending balance: Individually evaluated for impairment		940	462
Ending balance: Collectively evaluated for impairment		121,595	83,622
Ending balance	[1]	122,535	84,084
Agriculture [Member]
Ending balance: Individually evaluated for impairment		859	2,951
Ending balance: Collectively evaluated for impairment		101,727	108,994
Ending balance		102,586	111,945
Consumer and Other [Member]
Ending balance: Individually evaluated for impairment		45	4
Ending balance: Collectively evaluated for impairment		15,003	18,787
Ending balance		$ 15,048	$ 18,791
[1] Commercial loan portfolio as of December 31, 2020 includes $50.9 million Paycheck 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)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524

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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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