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2. Acquisition (Details) - Business Acquisition, Pro Forma Information - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 29, 2017	Oct. 30, 2016	Oct. 29, 2017	Oct. 30, 2016
Business Acquisition, Pro Forma Information [Abstract]
Net Sales	$ 165,777	$ 156,570	$ 474,610	$ 434,921
Net Income	$ 9,218	$ 7,268	$ 24,223	$ 16,257
Basic EPS	$ 0.79	$ 0.63	$ 2.09	$ 1.41
Diluted EPS	$ 0.78	$ 0.62	$ 2.06	$ 1.39

X

- Definition

Pro forma basic earnings per share or earnings per unit, which is commonly presented in initial public offerings based on the terms of the offering.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01(b)(4))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 7
-Subparagraph (SAB Topic 1.B.2)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5934-122674

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 1.B.3)
-URI http://asc.fasb.org/extlink&oid=6784503&loc=d3e463720-122850

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- References

No definition available.

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

Pro forma diluted earnings per share, which is commonly presented in initial public offerings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 1.B.3)
-URI http://asc.fasb.org/extlink&oid=6784503&loc=d3e463720-122850

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01(b)(4))
-URI http://asc.fasb.org/extlink&oid=27015980&loc=d3e46468-122699

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 205
-SubTopic 10
-Section S99
-Paragraph 7
-Subparagraph (SAB Topic 1.B.2)
-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5934-122674

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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