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Note 7 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Loans receivable		$ 1,143,305	$ 1,147,577
Financing receivable, recorded investment, 90 days past due and still accruing		84	39
Construction Real Estate [Member]
Loans receivable		37,476	45,497
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Family Residential Real Estate 1-4 [Member]
Loans receivable		231,468	213,562
Financing receivable, recorded investment, 90 days past due and still accruing		84	6
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		519,112	496,357
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture Real Estate [Member]
Loans receivable		153,247	151,992
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Loans receivable	[1]	85,569	122,535
Financing receivable, recorded investment, 90 days past due and still accruing		0	3
Agriculture [Member]
Loans receivable		101,087	102,586
Financing receivable, recorded investment, 90 days past due and still accruing		0	30
Consumer and Other [Member]
Loans receivable		15,346	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		3,046	2,798
Financing Receivables 30 to 89 Days Past Due [Member] | Construction Real Estate [Member]
Loans receivable		140	169
Financing Receivables 30 to 89 Days Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		1,080	1,523
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		0	152
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		1,139	574
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		495	283
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Loans receivable		136	79
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		56	18
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		485	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		170	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		0	3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Loans receivable		315	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		3,531	5,292
Financial Asset, Past Due [Member] | Construction Real Estate [Member]
Loans receivable		140	336
Financial Asset, Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		1,250	1,699
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		0	208
Financial Asset, Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		1,139	2,192
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		495	286
Financial Asset, Past Due [Member] | Agriculture [Member]
Loans receivable		451	537
Financial Asset, Past Due [Member] | Consumer and Other [Member]
Loans receivable		56	34
Financial Asset, Not Past Due [Member]
Loans receivable		1,139,774	1,142,285
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans receivable		37,336	45,161
Financial Asset, Not Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		230,218	211,863
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		519,112	496,149
Financial Asset, Not Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		152,108	149,800
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		85,074	122,249
Financial Asset, Not Past Due [Member] | Agriculture [Member]
Loans receivable		100,636	102,049
Financial Asset, Not Past Due [Member] | Consumer and Other [Member]
Loans receivable		$ 15,290	$ 15,014
[1] Commercial loan portfolio includes $14.8 million and $50.9 million of Paycheck Protection Program ("PPP") loans as of September 30, 2021 and December 31, 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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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
-Publisher FASB
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-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
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