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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
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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%

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