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Business and segment information Segment reporting (Details) $ in Thousands | 12 Months Ended
--- | ---
Jan. 31, 2017 USD ($) Segments | Jan. 31, 2016 USD ($)
Segment information [Line Items] |  |
Entity Incorporation, Date of Incorporation | Oct. 12, 1993 |
Number of reportable segments | Segments | 1 |
Net sales | $ 98,845 | $ 122,696
Gross profit | 11,716 | 26,741
Income (loss) from operations |  |
Income (loss) from operations | (10,788) | 2,878
Segment assets | 101,611 | 138,098
Capital expenditures | 2,257 | 5,051
Depreciation and amortization | 5,336 | 4,200
Piping Systems [Member] |  |
Segment information [Line Items] |  |
Net sales | 98,845 | 122,696
Gross profit | 11,716 | 26,741
Income (loss) from operations |  |
Income (loss) from operations | (2,435) | 10,537
Segment assets | 98,855 | 112,161
Capital expenditures | 1,925 | 4,762
Depreciation and amortization | 5,009 | 3,735
Corporate [Member] |  |
Income (loss) from operations |  |
Income (loss) from operations | (8,353) | (7,659)
Segment assets | 2,731 | 10,229
Capital expenditures | 332 | 289
Depreciation and amortization | 327 | 469
Operating Segments [Member] |  |
Income (loss) from operations |  |
Segment assets | $ 101,586 | $ 122,390

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