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Revenue recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 31, 2018 | Apr. 30, 2018 | Jul. 31, 2017 | Jul. 31, 2018 | Jul. 31, 2017
Disaggregation of Revenue [Line Items] |  |  |  |  |
Sales by product | $ 32,325 |  | $ 26,852 | $ 61,214 | $ 50,353
Sales by product (percent of total) | 100.00% |  | 100.00% | 100.00% | 100.00%
Revenue recognized that was included in contract liabilities | $ 422 | $ 1,810 |  |  |
Products [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Sales by product | $ 2,578 |  | $ 1,995 | $ 5,007 | $ 3,326
Sales by product (percent of total) | 8.00% |  | 7.00% | 8.00% | 7.00%
Specialty Piping Systems And Coating [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Sales by product (percent of total) | 90.00% |  |  |  |
Specialty Piping Systems And Coating [Member] | Transferred over Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Sales by product | $ 9,807 |  | $ 14,138 | $ 20,909 | $ 23,254
Sales by product (percent of total) | 30.00% |  | 53.00% | 34.00% | 46.00%
Specialty Piping Systems And Coating [Member] | Transferred at Point in Time [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Sales by product | $ 19,940 |  | $ 10,719 | $ 35,298 | $ 23,773
Sales by product (percent of total) | 62.00% |  | 40.00% | 58.00% | 47.00%

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