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Business segment reporting | 9 Months Ended
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Oct. 31, 2014
Segment reporting [Line Items] |
Segment Reporting Disclosure [Text Block] | Business segment reporting. The Company has two reportable segments: Piping Systems which engineers, designs, manufactures and sells specialty piping, leak detection and location systems, and Filtration Products, which manufactures custom-designed industrial filtration products to remove particulates from air and other gas streams. For the three months ended October 31, 2014 and 2013, respectively, no customer accounted for 10% of the Company's consolidated net sales. For the nine months ended October 31, 2014, one customer in Piping Systems accounted for 12.6% of the Company's consolidated net sales, and no customer accounted for 10% of the Company's consolidated net sales for the nine months ended October 31, 2013. At October 31, 2014, one customer in Piping Systems accounted for 33% of accounts receivable. At January 31, 2014, one customer in Piping Systems accounted for 24% of accounts receivable.
| Three Months Ended October 31, |  | Nine Months Ended October 31,
| 2014 |  | 2013 |  |  | 2014 |  | 2013 |
Net sales |  |  |  |  |
Piping Systems |  | $26,540 |  |  | $42,289 |  |  |  | $102,683 |  |  | $121,825 |
Filtration Products | 17,279 |  | 15,678 |  |  | 54,030 |  | 51,635 |
Total | 43,819 |  |  | $57,967 |  |  |  | $156,713 |  |  | $173,460 |
Gross profit |  |  |  |  |
Piping Systems |  | $4,609 |  |  | $14,726 |  |  |  | $25,913 |  |  | $35,760 |
Filtration Products | 2,112 |  | 2,161 |  |  | 7,342 |  | 7,277 |
Total |  | $6,721 |  |  | $16,887 |  |  |  | $33,255 |  |  | $43,037 |
Income (loss) from operations |  |  |  |  |
Piping Systems |  | $1,096 |  |  | $9,403 |  |  |  | $12,896 |  |  | $21,276 |
Filtration Products | (726 | ) | (486 | ) |  | (1,300 | ) | (468 | )
Corporate | (1,606 | ) | (2,130 | ) |  | (5,328 | ) | (6,715 | )
Total |  | ($1,236 | ) |  | $6,787 |  |  |  | $6,268 |  |  | $14,093 |
Prior to 2014, the Company did not allocate certain general administrative costs, including costs related to payroll processing and information systems, to its operating segments and instead included these costs and variances in corporate expenses. In 2014, the Company began allocating these costs and variances to its operating segments.

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- Definition The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 29 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8864-108599 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 32 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8933-108599 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 26 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8844-108599 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8538-108599 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8380-108599 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8981-108599 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8984-108599 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 41 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9038-108599 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8906-108599 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 42 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9054-108599 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8924-108599 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 40 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e9031-108599 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8971-108599 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8595-108599 + Details
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