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Nature of Operations, Segment Reporting and Geographical Information - Net Sales and Segment Operating Profit for Each Reporting Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Segment Reporting Information [Line Items]      
Revenue $ 136,657 $ 113,401 $ 98,448
Corporate Expenses 11,123 8,903 7,939
Operating Income 8,720 5,412 6,281
Other Income (Expense), Net $ (1,412) $ (255) $ 324
Segment Operating Profit % of Net Sales 14.50% 12.60% 14.40%
Income Before Income Taxes $ 7,308 $ 5,157 $ 6,605
Income Tax Provision 1,578 1,871 2,377
Net Income 5,730 3,286 4,228
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Operating Income 19,843 14,315 14,220
Operating Segments [Member] | Product Identification [Member]      
Segment Reporting Information [Line Items]      
Revenue 86,786 81,681 69,862
Operating Income $ 7,910 $ 10,561 $ 9,821
Segment Operating Profit % of Net Sales 9.10% 12.90% 14.10%
Operating Segments [Member] | T&M [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 49,871 $ 31,720 $ 28,586
Operating Income $ 11,933 $ 3,754 $ 4,399
Segment Operating Profit % of Net Sales 23.90% 11.80% 15.40%
Corporate Expenses [Member]      
Segment Reporting Information [Line Items]      
Corporate Expenses $ 11,123 $ 8,903 $ 7,939