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Note 5 - Credit Quality - Loans Modified as Troubled Debt Restructurings by Loan Class and Accrual Status (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Nonaccrual	[1]	$ 1,929	$ 1,284
Accrual		7,734	12,952
TDRs		9,663	14,236
Allowance for loan losses related to TDRs		642	670
Commercial Portfolio Segment [Member] | Single Family Non-owner Occupied [Member]
Nonaccrual	[1]	364	38
Accrual		528	892
TDRs		892	930
Commercial Portfolio Segment [Member] | Non-farm, Non-residential [Member]
Nonaccrual	[1]
Accrual		295	4,160
TDRs		295	4,160
Consumer Real Estate Portfolio Segment [Member] | Home Equity Lines [Member]
Nonaccrual	[1]
Accrual		145	158
TDRs		145	158
Consumer Real Estate Portfolio Segment [Member] | Single Family Owner Occupied [Member]
Nonaccrual	[1]	1,565	905
Accrual		6,496	7,503
TDRs		8,061	8,408
Consumer Real Estate Portfolio Segment [Member] | Owner Occupied Construction [Member]
Nonaccrual	[1]		341
Accrual		233	239
TDRs		233	580
Consumer and Other Portfolio Segment [Member]
TDRs
Consumer and Other Portfolio Segment [Member] | Consumer Loans [Member]
Nonaccrual	[1]
Accrual		37
TDRs		$ 37
[1] Nonaccrual TDRs are included in total nonaccrual loans disclosed in the nonaccrual table above.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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