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Note 7 - Loans Receivable and Credit Disclosures - Past Due Loans (Details) - USD ($) $ in Thousands		Jun. 30, 2021	Dec. 31, 2020
Loans receivable		$ 1,143,436	$ 1,147,577
Financing receivable, recorded investment, 90 days past due and still accruing		4	39
Construction Real Estate [Member]
Loans receivable		46,164	45,497
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Family Residential Real Estate 1-4 [Member]
Loans receivable		226,683	213,562
Financing receivable, recorded investment, 90 days past due and still accruing		4	6
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		498,561	496,357
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Agriculture Real Estate [Member]
Loans receivable		152,157	151,992
Financing receivable, recorded investment, 90 days past due and still accruing		0	0
Commercial Portfolio Segment [Member]
Loans receivable	[1]	106,016	122,535
Financing receivable, recorded investment, 90 days past due and still accruing		0	3
Agriculture [Member]
Loans receivable		98,233	102,586
Financing receivable, recorded investment, 90 days past due and still accruing		0	30
Consumer and Other [Member]
Loans receivable		15,622	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		4,811	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		791	1,523
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		2,525	152
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		577	574
Financing Receivables 30 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		828	283
Financing Receivables 30 to 89 Days Past Due [Member] | Agriculture [Member]
Loans receivable		67	79
Financing Receivables 30 to 89 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		23	18
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans receivable		408	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		103	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		6	3
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Agriculture [Member]
Loans receivable		294	458
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer and Other [Member]
Loans receivable		5	16
Financial Asset, Past Due [Member]
Loans receivable		5,219	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		894	1,699
Financial Asset, Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		2,525	208
Financial Asset, Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		577	2,192
Financial Asset, Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		834	286
Financial Asset, Past Due [Member] | Agriculture [Member]
Loans receivable		361	537
Financial Asset, Past Due [Member] | Consumer and Other [Member]
Loans receivable		28	34
Financial Asset, Not Past Due [Member]
Loans receivable		1,138,217	1,142,285
Financial Asset, Not Past Due [Member] | Construction Real Estate [Member]
Loans receivable		46,164	45,161
Financial Asset, Not Past Due [Member] | Family Residential Real Estate 1-4 [Member]
Loans receivable		225,789	211,863
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member]
Loans receivable		496,036	496,149
Financial Asset, Not Past Due [Member] | Agriculture Real Estate [Member]
Loans receivable		151,580	149,800
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member]
Loans receivable		105,182	122,249
Financial Asset, Not Past Due [Member] | Agriculture [Member]
Loans receivable		97,872	102,049
Financial Asset, Not Past Due [Member] | Consumer and Other [Member]
Loans receivable		$ 15,594	$ 15,014
[1] Commercial loan portfolio includes $37.6 million and $50.9 million of Paycheck Protection Program ("PPP") loans as of June 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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- 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
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