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Note 4 - Credit Quality - Loans Modified as Troubled Debt Restructurings by Loan Class and Accrual Status (Details) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
Nonaccrual	[1]	$ 2,006	$ 1,929
Accrual		7,297	7,734
TDRs		9,303	9,663
Allowance for loan losses related to TDRs		648	642
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Nonaccrual	[1]	348	364
Accrual		521	528
TDRs		869	892
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Nonaccrual	[1]
Accrual		291	295
TDRs		291	295
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Nonaccrual	[1]
Accrual		138	145
TDRs		138	145
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Nonaccrual	[1]	1,658	1,565
Accrual		6,081	6,496
TDRs		7,739	8,061
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Nonaccrual	[1]
Accrual		230	233
TDRs		230	233
Consumer and Other Portfolio Segment [Member]
TDRs			37
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Nonaccrual	[1]
Accrual		36	$ 37
TDRs		$ 36
[1] Nonaccrual TDRs are included in total nonaccrual loans disclosed in the nonaccrual table above.

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- Definition

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=82895541&loc=d3e18845-111554

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