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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Below Market Interest Rate [Member]
Total contracts		1	0
Pre-modification recorded investment		$ 31	$ 0
Post-modification recorded investment		$ 32	$ 0
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts		0	0
Pre-modification recorded investment		$ 0	$ 0
Post-modification recorded investment	[1]	$ 0	$ 0
Payment Deferral [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 1,390
Post-modification recorded investment	[1]	$ 0	$ 1,390
Payment Deferral [Member] | Non-farm, Non-residential [Member]
Total contracts		0	0
Pre-modification recorded investment		$ 0	$ 0
Post-modification recorded investment	[1]	$ 0	$ 0
Payment Deferral [Member] | Commercial and Industrial [Member]
Total contracts		0	0
Pre-modification recorded investment		$ 0	$ 0
Post-modification recorded investment		$ 0	$ 0
[1] Represents the loan balance immediately following modification

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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X

- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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X

- Definition

Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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