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Business segment reporting
 9 Months Ended
Oct. 31, 2011
Business Segment Reporting [Abstract]  
Segment Reporting Disclosure [Text Block]
Business segment reporting. The Company has three reportable segments. The piping systems business engineers, designs, manufactures and sells specialty piping systems and leak detection and location systems. The filtration products business manufactures and sells a wide variety of filter elements for air filtration and particulate collection. The industrial process cooling business engineers, designs, manufactures and sells chillers, cooling towers, plant circulating systems and accessories for industrial process applications. Included in corporate and other activity is a subsidiary which engages in the installation of heating, ventilation and air conditioning systems ("HVAC"), but which is not sufficiently large to constitute a reportable segment.
 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2011

 
2010

 
2011

 
2010

Net sales
 
 
 
 
 
 
 
Piping Systems

$35,371

 

$31,073

 

$80,737

 

$89,449

Filtration Products
24,000

 
21,159

 
74,122

 
61,318

Industrial Process Cooling
8,948

 
6,022

 
24,334

 
18,529

Corporate and Other
3,011

 
583

 
9,528

 
1,278

Total

$71,330

 

$58,837

 

$188,721

 

$170,574

Gross profit (loss)
 
 
 
 
 
 
 
Piping Systems

$6,222

 

$9,181

 

$13,666

 

$25,451

Filtration Products
3,409

 
2,912

 
10,258

 
7,990

Industrial Process Cooling
2,486

 
1,498

 
6,657

 
4,899

Corporate and Other
315

 
(36
)
 
877

 
(290
)
Total

$12,432

 

$13,555

 

$31,458

 

$38,050

Income (loss) from operations
 
 
 
 
 
 
 
Piping Systems

$3,026

 

$5,601

 

$3,730

 

$14,524

Filtration Products
315

 
120

 
1,341

 
(913
)
Industrial Process Cooling
517

 
(53
)
 
1,014

 
128

Corporate and Other
(1,626
)
 
(2,650
)
 
(5,409
)
 
(8,058
)
Total

$2,232

 

$3,018

 

$676

 

$5,681

Income (loss) before income taxes
 
 
 
 
 
 
 
Piping Systems

$3,709

 

$6,296

 

$4,314

 

$15,098

Filtration Products
315

 
120

 
1,341

 
(913
)
Industrial Process Cooling
517

 
(53
)
 
1,014

 
128

Corporate and Other
(2,021
)
 
(3,021
)
 
(6,423
)
 
(9,118
)
Total

$2,520

 

$3,342

 

$246

 

$5,195