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Business segment reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2015 USD ($) | Jul. 31, 2014 USD ($) | Jul. 31, 2015 USD ($) Segments | Jul. 31, 2014 USD ($) Rate | Jan. 31, 2015
Segment reporting |  |  |  |  |
Number of reportable segments | Segments |  |  | 2 |  |
Net sales | $ 40,061 | $ 53,370 | $ 77,735 | $ 112,894 |
Gross profit | 5,660 | 10,545 | 9,701 | 26,534 |
(Loss) income from operations | (2,475) | 1,795 | $ (7,275) | 7,504 |
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 | 25,147 | 33,789 | $ 45,424 | 76,143 |
Gross profit | 3,126 | 7,846 | 5,481 | 21,304 |
(Loss) income from operations | (825) | 3,783 | $ (2,251) | 11,800 |
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 | 14,914 | 19,581 | $ 32,311 | 36,751 |
Gross profit | 2,534 | 2,699 | 4,220 | 5,230 |
(Loss) income from operations | 55 | (30) | (1,175) | (574) |
Corporate Segment [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
(Loss) income from operations | $ (1,705) | $ (1,958) | $ (3,849) | $ (3,722) |
Credit Concentration Risk [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Concentration Risk, Percentage |  |  | 23.00% |  | 31.00%
Sales Revenue, Net [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Concentration Risk, Percentage | Rate |  |  |  | 14.00% |

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