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Segment Information - Net Sales and Segment Operating Profit for Each Reporting Segment (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Oct. 27, 2018
Oct. 28, 2017
Oct. 27, 2018
Oct. 28, 2017
Segment Reporting Information [Line Items]        
Revenue $ 34,196,000 $ 28,760,000 $ 99,490,000 $ 80,701,000
Corporate Expenses 2,836,000 2,597,000 8,298,000 6,780,000
Operating Income 2,362,000 1,632,000 5,791,000 3,281,000
Other Income (Expense), Net (538,000) (12,000) (1,320,000) (45,000)
Income Before Income Taxes 1,824,000 1,620,000 4,471,000 3,236,000
Income Tax Provision 407,000 201,000 1,046,000 579,000
Net Income 1,417,000 1,419,000 3,425,000 2,657,000
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Operating Income 5,198,000 4,229,000 14,089,000 10,061,000
Operating Segments [Member] | Product Identification [Member]        
Segment Reporting Information [Line Items]        
Revenue 21,684,000 20,458,000 63,407,000 59,945,000
Operating Income 2,014,000 2,657,000 5,833,000 7,761,000
Operating Segments [Member] | T&M [Member]        
Segment Reporting Information [Line Items]        
Revenue 12,512,000 8,302,000 36,083,000 20,756,000
Operating Income 3,184,000 1,572,000 8,256,000 2,300,000
Corporate Expenses [Member]        
Segment Reporting Information [Line Items]        
Corporate Expenses $ 2,836,000 $ 2,597,000 $ 8,298,000 $ 6,780,000