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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Total contracts		1	7
Pre-modification recorded investment		$ 1,390	$ 2,493
Post-modification recorded investment	[1]	$ 1,390	$ 2,493
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 50
Post-modification recorded investment	[1]	$ 0	$ 50
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts		0	1
Pre-modification recorded investment			$ 0
Post-modification recorded investment	[1]		$ 0
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts			0
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Pre-modification recorded investment		$ 0	$ 50
Post-modification recorded investment	[1]	$ 0	$ 50
Payment Deferral [Member]
Total contracts		1	6
Pre-modification recorded investment		$ 1,390	$ 2,443
Post-modification recorded investment	[1]	$ 1,390	$ 2,443
Payment Deferral [Member] | Single Family Non-owner Occupied [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 529
Post-modification recorded investment	[1]	$ 0	$ 529
Payment Deferral [Member] | Single Family Owner Occupied [Member]
Total contracts		0	2
Pre-modification recorded investment		$ 0	$ 672
Post-modification recorded investment	[1]	$ 0	$ 672
Payment Deferral [Member] | Construction, Development and Other Land [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 63
Post-modification recorded investment	[1]	$ 0	$ 63
Payment Deferral [Member] | Commercial and Industrial [Member]
Total contracts		0	1
Pre-modification recorded investment		$ 0	$ 602
Post-modification recorded investment	[1]	$ 0	$ 602
Payment Deferral [Member] | Non-farm, Non-residential [Member]
Total contracts		1	1
Pre-modification recorded investment		$ 1,390	$ 577
Post-modification recorded investment	[1]	$ 1,390	$ 577
[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 http://asc.fasb.org/extlink&oid=121611835&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 http://asc.fasb.org/extlink&oid=121611835&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 http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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