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Note 5 - Credit Quality - Loans Modified as Troubled Debt Restructurings (Details) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2019 USD ($)
Total contracts		4	2	11	7
Pre-modification recorded investment		$ 2,714	$ 265	$ 5,207	$ 1,013
Post-modification recorded investment	[1]	$ 2,698	$ 265	$ 5,191	$ 964
Below Market Interest Rate [Member]
Total contracts				1
Pre-modification recorded investment				$ 50
Post-modification recorded investment	[1]			$ 50
Below Market Interest Rate [Member] | Single Family Owner Occupied [Member]
Total contracts			1	1
Pre-modification recorded investment			$ 80	$ 50
Post-modification recorded investment	[1]		$ 81	$ 50
Below Market Interest Rate and Extended Payment Term [Member]
Total contracts			2		5
Pre-modification recorded investment			$ 265		$ 943
Post-modification recorded investment	[1]		$ 265		$ 916
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Owner Occupied [Member]
Total contracts		1		1	3
Pre-modification recorded investment		$ 70		$ 529	$ 454
Post-modification recorded investment	[1]	$ 54		$ 529	$ 432
Below Market Interest Rate and Extended Payment Term [Member] | Single Family Non-owner Occupied [Member]
Total contracts			1		2
Pre-modification recorded investment			$ 185		$ 489
Post-modification recorded investment	[1]		$ 184		$ 484
Payment Deferral [Member]
Total contracts		4		10	2
Pre-modification recorded investment		$ 2,714		$ 5,157	$ 70
Post-modification recorded investment	[1]	$ 2,698		$ 5,141	$ 48
Payment Deferral [Member] | Single Family Non-owner Occupied [Member]
Total contracts				3	1
Pre-modification recorded investment				$ 742	$ 66
Post-modification recorded investment	[1]			$ 726	$ 45
Payment Deferral [Member] | Commercial and Industrial [Member]
Total contracts		1		2
Pre-modification recorded investment		$ 1,106		$ 1,708
Post-modification recorded investment	[1]	$ 1,106		$ 1,708
Payment Deferral [Member] | Non-farm, Non-residential [Member]
Total contracts		2		3
Pre-modification recorded investment		$ 1,538		$ 2,115
Post-modification recorded investment	[1]	$ 1,538		$ 2,115
Payment Deferral [Member] | Construction, Development and Other Land [Member]
Total contracts				1
Pre-modification recorded investment				$ 63
Post-modification recorded investment	[1]			$ 63
Payment Deferral [Member] | Home Equity Lines [Member]
Total contracts					1
Pre-modification recorded investment					$ 4
Post-modification recorded investment	[1]				$ 3
[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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- 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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- 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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