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Business segment reporting
 3 Months Ended
Apr. 30, 2013
Segment reporting [Line Items]  
Segment Reporting Disclosure [Text Block]
Business segment reporting. The Company has two reportable segments. Piping systems engineers, designs, manufactures and sells specialty piping and leak detection and location systems. Filtration products manufactures and sells a wide variety of filter elements for air filtration and particulate collection. Effective May 1, 2013, the Company made changes to its management reporting structure and industrial process cooling is no longer a reportable segment of the Company. Included in corporate and other activity is a subsidiary which engages in the installation of heating, ventilation and air conditioning systems and a subsidiary that engineers, designs, manufactures and sells chillers, plant circulating systems and accessories for industrial process applications, but neither one is sufficiently large to constitute a reportable segment. For additional information, see "Notes to Consolidated Financial Statements, Note 3 Discontinued operations".
 
Three Months Ended April 30,
 
2013

2012

Net sales
 
 
Piping Systems

$36,058


$19,744

Filtration Products
18,633

22,976

Corporate and Other
3,053

1,779

Total

$57,744


$44,499

Gross profit
 
 
Piping Systems

$10,444


$3,398

Filtration Products
2,275

3,112

Corporate and Other
413

322

Total

$13,132


$6,832

Income (loss) from operations
 
 
Piping Systems

$5,380


$155

Filtration Products
(483
)
196

Corporate and Other
(2,092
)
(2,648
)
Total

$2,805


($2,297
)
Income (loss) continuing operations before income taxes
 
 
Piping Systems

$5,084


($91
)
Filtration Products
(483
)
196

Corporate and Other
(2,581
)
(3,019
)
Total

$2,020


($2,914
)