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Segment Information - Net Sales and Segment Operating Profit for Each Reporting Segment (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 28, 2018	Jul. 29, 2017	Jul. 28, 2018	Jul. 29, 2017
Segment Reporting Information [Line Items]
Revenue	$ 33,807	$ 27,483	$ 65,294	$ 51,941
Corporate Expenses	2,808	2,327	5,462	4,183
Operating Income	2,165	942	3,429	1,649
Other Income (Expense), Net	(512)	16	(782)	(33)
Income Before Income Taxes	1,653	958	2,647	1,616
Income Tax Provision	459	231	639	378
Net Income	1,194	727	2,008	1,238
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Income	4,973	3,269	8,891	5,832
Operating Segments [Member] | Product Identification [Member]
Segment Reporting Information [Line Items]
Revenue	21,769	20,841	41,722	39,487
Operating Income	2,159	2,612	3,820	5,104
Operating Segments [Member] | T&M [Member]
Segment Reporting Information [Line Items]
Revenue	12,038	6,642	23,572	12,454
Operating Income	2,814	657	5,071	728
Corporate Expenses [Member]
Segment Reporting Information [Line Items]
Corporate Expenses	$ 2,808	$ 2,327	$ 5,462	$ 4,183

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