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Business and segment information Geographic information (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2017 | Jan. 31, 2016
Geographic information [Line Items] |  |
foreign sales | 57.00% | 50.00%
Net sales | $ 98,845 | $ 122,696
Property, plant and equipment, net of accumulated depreciation | 36,275 | 25,400
United States |  |
Geographic information [Line Items] |  |
Net sales | 42,048 | 58,707
Property, plant and equipment, net of accumulated depreciation | 11,747 | 13,822
Middle East [Member] |  |
Geographic information [Line Items] |  |
Net sales | 28,009 | 60,749
Property, plant and equipment, net of accumulated depreciation | 10,987 | 11,211
Canada |  |
Geographic information [Line Items] |  |
Net sales | 25,915 | 2,581
Property, plant and equipment, net of accumulated depreciation | 13,276 | 0
India |  |
Geographic information [Line Items] |  |
Net sales | 2,360 | 372
Property, plant and equipment, net of accumulated depreciation | 265 | 367
Other |  |
Geographic information [Line Items] |  |
Net sales | $ 513 | $ 287

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- Definition Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(14)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(8)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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