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Business information Geographic information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2018 | Jan. 31, 2017
Geographic information [Line Items] |  |
foreign sales | 59.50% | 57.00%
Net sales | $ 105,248 | $ 98,845
Property, plant and equipment, net of accumulated depreciation | 34,509 | 36,275
United States |  |
Geographic information [Line Items] |  |
Net sales | 42,648 | 42,048
Property, plant and equipment, net of accumulated depreciation | 11,307 | 11,747
Canada |  |
Geographic information [Line Items] |  |
Net sales | 31,206 | 25,915
Property, plant and equipment, net of accumulated depreciation | 13,868 | 13,276
Middle East [Member] |  |
Geographic information [Line Items] |  |
Net sales | 26,322 | 28,009
Property, plant and equipment, net of accumulated depreciation | 9,119 | 10,987
India |  |
Geographic information [Line Items] |  |
Net sales | 1,317 | 2,360
Property, plant and equipment, net of accumulated depreciation | 215 | 265
Other |  |
Geographic information [Line Items] |  |
Net sales | $ 3,755 | $ 513

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