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Nature of Operations, Segment Reporting and Geographical Information - Net Sales and Segment Operating Profit (loss) for Each Reporting Segment (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Jan. 31, 2019
Segment Reporting Information [Line Items]      
Revenue $ 116,033 $ 133,446 $ 136,657
Corporate Expenses 9,420 11,357 11,123
Operating Income 2,433 2,433 8,720
Other Expense, Net $ (254) $ (1,063) $ (1,412)
Segment Operating Profit % of Net Sales (10.30%) 10.30% 14.50%
Income before Income Taxes $ 2,179 $ 1,370 $ 7,308
Income Tax Provision (Benefit) 895 (389) 1,578
Net Income 1,284 1,759 5,730
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Operating Income 11,853 13,790 19,843
Operating Segments [Member] | Product Identification [Member]      
Segment Reporting Information [Line Items]      
Revenue 90,268 88,116 86,786
Operating Income $ 12,885 $ 7,509 $ 7,910
Segment Operating Profit % of Net Sales 14.30% 8.50% 9.10%
Operating Segments [Member] | T&M [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 25,765 $ 45,330 $ 49,871
Operating Income $ (1,032) $ 6,281 $ 11,933
Segment Operating Profit % of Net Sales (4.00%) 13.90% 23.90%
Corporate Expenses [Member]      
Segment Reporting Information [Line Items]      
Corporate Expenses $ 9,420 $ 11,357 $ 11,123