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Business segment reporting
 9 Months Ended
Oct. 31, 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 custom-designed industrial filtration products to remove particulates from air and other gas streams. Effective May 1, 2013, industrial process cooling ceased to be a reportable segment of the Company. For additional information, see "Notes to Consolidated Financial Statements, Note 3 Discontinued operations".
 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2013

2012

 
2013

2012

Net sales
 
 
 
 
 
Piping Systems

$42,289


$26,498

 

$121,825


$69,147

Filtration Products
15,678

20,738

 
51,635

62,990

Total

$57,967


$47,236

 

$173,460


$132,137

Gross profit
 
 
 
 
 
Piping Systems

$14,726


$6,060

 

$35,760


$14,327

Filtration Products
2,161

2,616

 
7,277

8,280

Total

$16,887


$8,676

 

$43,037


$22,607

Income (loss) from operations
 
 
 
 
 
Piping Systems

$9,403


$2,585

 

$21,276


$4,184

Filtration Products
(486
)
(410
)
 
(468
)
(505
)
Corporate
(2,537
)
(1,990
)
 
(6,715
)
(6,516
)
Total

$6,380


$185

 

$14,093


($2,837
)