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Business segment reporting (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2015 USD ($)	Jul. 31, 2014 USD ($)	Jul. 31, 2015 USD ($) Segments	Jul. 31, 2014 USD ($) Rate	Jan. 31, 2015
Segment reporting
Number of reportable segments | Segments			2
Net sales	$ 40,061	$ 53,370	$ 77,735	$ 112,894
Gross profit	5,660	10,545	9,701	26,534
(Loss) income from operations	(2,475)	1,795	$ (7,275)	7,504
Piping Systems [Member]
Segment reporting
Segment Reporting Information, Description of Products and Services			Piping Systems, which engineers, designs, manufactures and sells specialty piping, leak detection and location systems
Net sales	25,147	33,789	$ 45,424	76,143
Gross profit	3,126	7,846	5,481	21,304
(Loss) income from operations	(825)	3,783	$ (2,251)	11,800
Filtration Products [Member]
Segment reporting
Segment Reporting Information, Description of Products and Services			Filtration Products, which manufactures custom-designed industrial filtration products to remove particulates from air and other gas streams
Net sales	14,914	19,581	$ 32,311	36,751
Gross profit	2,534	2,699	4,220	5,230
(Loss) income from operations	55	(30)	(1,175)	(574)
Corporate Segment [Member]
Segment reporting
(Loss) income from operations	$ (1,705)	$ (1,958)	$ (3,849)	$ (3,722)
Credit Concentration Risk [Member]
Segment reporting
Concentration Risk, Percentage			23.00%		31.00%
Sales Revenue, Net [Member]
Segment reporting
Concentration Risk, Percentage | Rate				14.00%

X

- 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.

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