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Business segment reporting (Details) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2015 USD ($) | Oct. 31, 2014 USD ($) | Oct. 31, 2015 USD ($) Segments | Oct. 31, 2014 USD ($) Rate | Jan. 31, 2015
Segment reporting |  |  |  |  |
Number of reportable segments | Segments |  |  | 2 |  |
Net sales | $ 66,316 | $ 43,819 | $ 144,051 | $ 156,713 |
Gross profit | 16,971 | 6,721 | 26,672 | 33,255 |
Income (loss) from operations | 7,360 | (1,236) | $ 85 | 6,268 |
Piping Systems [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Segment Reporting Information, Description of Products and Services |  |  | Piping Systems, which engineers, designs, manufactures and sells specialty piping, leak detection and location systems |  |
Net sales | 46,950 | 26,540 | $ 92,374 | 102,683 |
Gross profit | 14,315 | 4,609 | 19,796 | 25,913 |
Income (loss) from operations | 9,721 | 1,096 | $ 7,470 | 12,896 |
Filtration Products [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Segment Reporting Information, Description of Products and Services |  |  | Filtration Products, which manufactures custom-designed industrial filtration products to remove particulates from air and other gas streams |  |
Net sales | 19,366 | 17,279 | $ 51,677 | 54,030 |
Gross profit | 2,656 | 2,112 | 6,876 | 7,342 |
Income (loss) from operations | (162) | (726) | (1,337) | (1,300) |
Corporate Segment [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Income (loss) from operations | $ (2,199) | $ (1,606) | $ (6,048) | $ (5,328) |
Credit Concentration Risk [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Concentration Risk, Percentage |  |  | 17.00% |  | 31.00%
Sales Revenue, Net [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Concentration Risk, Percentage | Rate |  |  |  | 12.60% |

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