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Business segment reporting (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended | 3 Months Ended | 6 Months Ended
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Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2014 Segments | Jul. 31, 2013 | Jul. 31, 2014 Piping Systems [Member] | Jul. 31, 2013 Piping Systems [Member] | Jul. 31, 2014 Piping Systems [Member] | Jul. 31, 2013 Piping Systems [Member] | Jul. 31, 2014 Filtration Products [Member] | Jul. 31, 2013 Filtration Products [Member] | Jul. 31, 2014 Filtration Products [Member] | Jul. 31, 2013 Filtration Products [Member] | Jul. 31, 2014 Corporate Segment [Member] | Jul. 31, 2013 Corporate Segment [Member] | Jul. 31, 2014 Corporate Segment [Member] | Jul. 31, 2013 Corporate Segment [Member] | Jul. 31, 2014 Credit Concentration Risk [Member] | Jan. 31, 2014 Credit Concentration Risk [Member] | Jul. 31, 2013 Sales Revenue, Net [Member] | Jul. 31, 2014 Sales Revenue, Net [Member]
Segment reporting |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% | 24.00% | 11.00% | 14.00%
Net sales | $ 53,370 | $ 60,802 | $ 112,894 | $ 115,493 | $ 33,789 | $ 43,478 | $ 76,143 | $ 79,536 | $ 19,581 | $ 17,324 | $ 36,751 | $ 35,957 |  |  |  |  |  |  |  |
Gross profit | 10,545 | 13,431 | 26,534 | 26,150 | 7,846 | 10,590 | 21,304 | 21,034 | 2,699 | 2,841 | 5,230 | 5,116 |  |  |  |  |  |  |  |
Income from operations | $ 1,795 | $ 4,770 | $ 7,504 | $ 7,303 | $ 3,783 | $ 6,493 | $ 11,800 | $ 11,873 | $ (30) | $ 501 | $ (574) | $ 18 | $ (1,958) | $ (2,224) | $ (3,722) | $ (4,588) |  |  |  |

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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=35750535&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=35750535&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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