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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, 2017
Jan. 31, 2016
Jan. 31, 2015
Segment Reporting Information [Line Items]      
Revenue $ 98,448 $ 94,658 $ 88,347
Corporate Expenses 7,939 7,030 5,655
Operating Income 6,281 5,934 7,231
Other Income (Expense)-Net $ 324 $ 975 $ (299)
Segment Operating Profit % of Net Sales 14.40% 13.70% 14.60%
Income Before Income Taxes $ 6,605 $ 6,909 $ 6,932
Income Tax Provision 2,377 2,384 2,270
Net Income 4,228 4,525 4,662
Operating Segments [Member]      
Segment Reporting Information [Line Items]      
Operating Income 14,220 12,964 12,886
Operating Segments [Member] | Product Identification [Member]      
Segment Reporting Information [Line Items]      
Revenue 69,862 67,127 59,779
Operating Income $ 9,821 $ 9,300 $ 7,259
Segment Operating Profit % of Net Sales 14.10% 13.90% 12.10%
Operating Segments [Member] | T&M [Member]      
Segment Reporting Information [Line Items]      
Revenue $ 28,586 $ 27,531 $ 28,568
Operating Income $ 4,399 $ 3,664 $ 5,627
Segment Operating Profit % of Net Sales 15.40% 13.30% 19.70%