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Note 4 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2021	Dec. 31, 2020
Loans receivable		$ 1,160,667	$ 1,147,577
Financing receivable, recorded investment, 90 days past due and still accruing		169	39
Construction Real Estate [Member]
Loans receivable		42,638	45,497
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Family Residential Real Estate 1-4 [Member]
Loans receivable		246,745	213,562
Financing receivable, recorded investment, 90 days past due and still accruing		169	6
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		515,367	496,357
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture Real Estate [Member]
Loans receivable		153,457	151,992
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Loans receivable	[1]	75,482	122,535
Financing receivable, recorded investment, 90 days past due and still accruing		0	3
Agriculture [Member]
Loans receivable		111,881	102,586
Financing receivable, recorded investment, 90 days past due and still accruing		0	30
Consumer and Other [Member]
Loans receivable		15,097	15,048
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Financing Receivables 30 to 89 Days Past Due [Member]
Loans receivable		1,724	2,798
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable		0	169
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		1,198	1,523
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		24	152
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		30	574
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		251	283
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Loans receivable		172	79
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		49	18
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		497	2,494
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable		0	167
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		482	176
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		0	56
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		0	1,618
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		15	3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Loans receivable		0	458
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		0	16
Financial Asset, Past Due [Member]
Loans receivable		2,221	5,292
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Loans receivable		0	336
Financial Asset, Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		1,680	1,699
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		24	208
Financial Asset, Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		30	2,192
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		266	286
Financial Asset, Past Due [Member] | Agriculture [Member]
Loans receivable		172	537
Financial Asset, Past Due [Member] | Consumer and Other [Member]
Loans receivable		49	34
Financial Asset, Not Past Due [Member]
Loans receivable		1,158,446	1,142,285
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans receivable		42,638	45,161
Financial Asset, Not Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		245,065	211,863
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		515,343	496,149
Financial Asset, Not Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		153,427	149,800
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		75,216	122,249
Financial Asset, Not Past Due [Member] | Agriculture [Member]
Loans receivable		111,709	102,049
Financial Asset, Not Past Due [Member] | Consumer and Other [Member]
Loans receivable		$ 15,048	$ 15,014
[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

Amount of financing receivable 90 days or more past due and still accruing.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 80
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448

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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
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