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Note 5 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Total contracts		1	2	4	3
Pre-modification recorded investment		$ 94	$ 302	$ 362	$ 1,692
Post-modification recorded investment	[1]	$ 72	$ 283	$ 349	$ 1,651
Extended Maturity [Member]
Total contracts		1	0
Pre-modification recorded investment		$ 94	$ 0
Post-modification recorded investment	[1]	$ 72	$ 0
Extended Maturity [Member] | Single Family Owner Occupied [Member]
Total contracts		1	0
Pre-modification recorded investment		$ 94	$ 0
Post-modification recorded investment	[1]	$ 72	$ 0
Below Market Interest Rate [Member]
Total contracts				1	0
Pre-modification recorded investment				$ 31	$ 0
Post-modification recorded investment	[1]			$ 32	$ 0
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts				1	0
Pre-modification recorded investment				$ 31	$ 0
Post-modification recorded investment	[1]			$ 32	$ 0
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts		0	2	0	2
Pre-modification recorded investment		$ 0	$ 302	$ 0	$ 302
Post-modification recorded investment	[1]	$ 0	$ 283	$ 0	$ 283
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts		0	2	0	2
Pre-modification recorded investment		$ 0	$ 302	$ 0	$ 302
Post-modification recorded investment	[1]	$ 0	$ 283	$ 0	$ 283
Payment Deferral [Member]
Total contracts				3	1
Pre-modification recorded investment				$ 331	$ 1,390
Post-modification recorded investment	[1]			$ 317	$ 1,368
Payment Deferral [Member] | Single Family Non-owner Occupied [Member]
Total contracts				3	0
Pre-modification recorded investment				$ 331	$ 0
Post-modification recorded investment	[1]			$ 317	$ 0
Payment Deferral [Member] | Non-farm, Non-residential [Member]
Total contracts				0	1
Pre-modification recorded investment				$ 0	$ 1,390
Post-modification recorded investment	[1]			$ 0	$ 1,368
[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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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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