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Business segment reporting (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 31, 2016 USD ($) Segments | Jul. 31, 2015 USD ($) | Jul. 31, 2016 USD ($) | Jul. 31, 2015 USD ($) | Jan. 31, 2016
Segment reporting |  |  |  |  |
Number of reportable segments | Segments | 1 |  |  |  |
Net sales | $ 22,859 | $ 25,147 | $ 45,928 | $ 45,424 |
Gross profit | 2,980 | 3,126 | 4,972 | 5,481 |
Loss from operations | (1,840) | (2,530) | $ (6,345) | (6,100) |
Piping Systems [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Segment Reporting Information, Description of Products and Services |  |  | Piping Systems engineers, designs, manufactures and sells specialty piping, leak detection and location systems |  |
Net sales | 22,859 | 25,147 | $ 45,928 | 45,424 |
Gross profit | 2,980 | 3,126 | 4,972 | 5,481 |
Loss from operations | (714) | (825) | (2,415) | (2,251) |
Corporate Segment [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Loss from operations | $ (1,126) | $ (1,705) | $ (3,930) | $ (3,849) |
Credit Concentration Risk [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Concentration Risk, Percentage |  |  | 16.00% |  | 46.00%
Sales Revenue, Net [Member] |  |  |  |  |
Segment reporting |  |  |  |  |
Concentration Risk, Percentage |  | 10.20% | 10.70% |  |

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