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Business segment reporting (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 30, 2016 USD ($) Segments | Apr. 30, 2015 USD ($) | Jan. 31, 2016
Segment reporting |  |  |
Number of reportable segments | Segments | 1 |  |
Net sales | $ 23,069 | $ 20,277 |
Gross profit | 1,992 | 2,355 |
Loss from operations | $ (4,505) | (3,570) |
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 | $ 23,069 | 20,277 |
Gross profit | 1,992 | 2,355 |
Loss from operations | (1,701) | (1,426) |
Corporate Segment [Member] |  |  |
Segment reporting |  |  |
Loss from operations | $ (2,804) | $ (2,144) |
Credit Concentration Risk [Member] |  |  |
Segment reporting |  |  |
Concentration Risk, Percentage | 28.00% |  | 46.00%
Sales Revenue, Net [Member] |  |  |
Segment reporting |  |  |
Concentration Risk, Percentage | 15.00% | 11.00% |

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