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(Tables)
 6 Months Ended
Jul. 31, 2012
Business segment reporting [Abstract]  
Business segment reporting [Table Text Block]
 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2012

2011

 
2012

2011

Net sales
 
 
 
 
 
Piping Systems

$22,905


$26,339

 

$42,649


$45,366

Filtration Products
19,276

25,279

 
42,252

50,122

Industrial Process Cooling
8,895

8,231

 
18,026

15,386

Corporate and Other
1,185

4,141

 
2,062

6,517

Total

$52,261


$63,990

 

$104,989


$117,391

Gross profit
 
 
 
 
 
Piping Systems

$4,869


$4,631

 

$8,267


$7,444

Filtration Products
2,552

3,537

 
5,664

6,849

Industrial Process Cooling
2,437

2,226

 
4,969

4,171

Corporate and Other
48

390

 
134

562

Total

$9,906


$10,784

 

$19,034


$19,026

Income (loss) from operations
 
 
 
 
 
Piping Systems

$1,443


$927

 

$1,598


$704

Filtration Products
(292
)
516

 
(96
)
1,026

Industrial Process Cooling
314

293

 
877

497

Corporate and Other
(2,136
)
(1,648
)
 
(4,769
)
(3,783
)
Total

($671
)

$88

 

($2,390
)

($1,556
)
Income (loss) before income taxes
 
 
 
 
 
Piping Systems

$1,511


$1,011

 

$1,421


$605

Filtration Products
(292
)
516

 
(96
)
1,026

Industrial Process Cooling
314

293

 
877

497

Corporate and Other
(2,555
)
(1,980
)
 
(5,560
)
(4,402
)
Total

($1,022
)

($160
)
 

($3,358
)

($2,274
)