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Note 4 - Loans Receivable and Credit Disclosures - Loans Receivable Impairment Analysis (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Ending balance: Individually evaluated for impairment		$ 12,312	$ 15,273
Ending balance: Collectively evaluated for impairment		1,148,355	1,132,304
Ending balance		1,160,667	1,147,577
Construction Real Estate [Member]
Ending balance: Individually evaluated for impairment		0	167
Ending balance: Collectively evaluated for impairment		42,638	45,330
Ending balance		42,638	45,497
Family Residential Real Estate 1-4 [Member]
Ending balance: Individually evaluated for impairment		980	1,340
Ending balance: Collectively evaluated for impairment		245,765	212,222
Ending balance		246,745	213,562
Commercial Real Estate Portfolio Segment [Member]
Ending balance: Individually evaluated for impairment		9,792	10,258
Ending balance: Collectively evaluated for impairment		505,575	486,099
Ending balance		515,367	496,357
Agriculture Real Estate [Member]
Ending balance: Individually evaluated for impairment		546	1,664
Ending balance: Collectively evaluated for impairment		152,911	150,328
Ending balance		153,457	151,992
Commercial Portfolio Segment [Member]
Ending balance: Individually evaluated for impairment		330	940
Ending balance: Collectively evaluated for impairment		75,152	121,595
Ending balance	[1]	75,482	122,535
Agriculture [Member]
Ending balance: Individually evaluated for impairment		637	859
Ending balance: Collectively evaluated for impairment		111,244	101,727
Ending balance		111,881	102,586
Consumer and Other [Member]
Ending balance: Individually evaluated for impairment		27	45
Ending balance: Collectively evaluated for impairment		15,070	15,003
Ending balance		$ 15,097	$ 15,048
[1] Commercial loan portfolio includes $6.0 million and $50.9 million of Paycheck Protection Program ("PPP") loans as of December 31, 2021 and 2020, respectively

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=123577603&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=123577603&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=124259787&loc=d3e4428-111522

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