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Note 7 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2022	Dec. 31, 2021
Loans receivable		$ 1,146,230	$ 1,160,667
Financing receivable, recorded investment, 90 days past due and still accruing		0	169
Construction Real Estate [Member]
Loans receivable		46,140	42,638
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Family Residential Real Estate 1-4 [Member]
Loans receivable		256,362	246,745
Financing receivable, recorded investment, 90 days past due and still accruing		0	169
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		507,598	515,367
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture Real Estate [Member]
Loans receivable		152,136	153,457
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Loans receivable	[1]	71,150	75,482
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture [Member]
Loans receivable		96,197	111,881
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Consumer and Other [Member]
Loans receivable		16,647	15,097
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Financing Receivables 30 to 89 Days Past Due [Member]
Loans receivable		2,879	1,724
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable		0	0
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		989	1,198
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		24	24
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		408	30
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		549	251
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Loans receivable		894	172
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		15	49
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		265	497
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		216	482
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		49	15
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Loans receivable		0	0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		0	0
Financial Asset, Past Due [Member]
Loans receivable		3,144	2,221
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Loans receivable		0	0
Financial Asset, Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		1,205	1,680
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		24	24
Financial Asset, Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		408	30
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		598	266
Financial Asset, Past Due [Member] | Agriculture [Member]
Loans receivable		894	172
Financial Asset, Past Due [Member] | Consumer and Other [Member]
Loans receivable		15	49
Financial Asset, Not Past Due [Member]
Loans receivable		1,143,086	1,158,446
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans receivable		46,140	42,638
Financial Asset, Not Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		255,157	245,065
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		507,574	515,343
Financial Asset, Not Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		151,728	153,427
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		70,552	75,216
Financial Asset, Not Past Due [Member] | Agriculture [Member]
Loans receivable		95,303	111,709
Financial Asset, Not Past Due [Member] | Consumer and Other [Member]
Loans receivable		$ 16,632	$ 15,048
[1] Commercial loan portfolio includes $0.3 million and $6.0 million of Paycheck Protection Program ("PPP") loans as of March 31, 2022 and December 31, 2021, respectively.

X

- Definition

Amortized cost of financing receivable 90 days or more past due and still accruing. Excludes net investment in lease.

+ 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 https://asc.fasb.org/extlink&oid=124255953&loc=SL82919258-210447

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (b)
-URI https://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 https://asc.fasb.org/extlink&oid=124267575&loc=SL82922355-210448

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X

- 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
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-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522

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