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Business segment reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended
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Apr. 30, 2014 Segments | Apr. 30, 2013 | Apr. 30, 2014 Piping Systems [Member] | Apr. 30, 2013 Piping Systems [Member] | Apr. 30, 2014 Filtration Products [Member] | Apr. 30, 2013 Filtration Products [Member] | Apr. 30, 2014 Corporate Segment [Member] | Apr. 30, 2013 Corporate Segment [Member] | Apr. 30, 2014 Credit Concentration Risk [Member] | Jan. 31, 2014 Credit Concentration Risk [Member] | Apr. 30, 2014 Sales Revenue, Net [Member]
Segment reporting |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | 2 |  |  |  |  |  |  |  |  |  |
Net sales | $ 59,524 | $ 54,691 | $ 42,354 | $ 36,058 | $ 17,170 | $ 18,633 |  |  |  |  |
Gross profit | 15,989 | 12,719 | 13,458 | 10,444 | 2,531 | 2,275 |  |  |  |  |
Income from operations | $ 5,709 | $ 2,533 | $ 8,017 | $ 5,380 | $ (544) | $ (483) | $ (1,764) | $ (2,364) |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  | 42.00% | 24.00% | 21.00%

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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