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Business segment (Tables)
 9 Months Ended
Oct. 31, 2014
Business segment reporting [Abstract]  
Business segment reporting [Table Text Block]
 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2014

2013

 
2014

2013

Net sales
 
 
 
 
 
Piping Systems

$26,540


$42,289

 

$102,683


$121,825

Filtration Products
17,279

15,678

 
54,030

51,635

Total
43,819


$57,967

 

$156,713


$173,460

Gross profit
 
 
 
 
 
Piping Systems

$4,609


$14,726

 

$25,913


$35,760

Filtration Products
2,112

2,161

 
7,342

7,277

Total

$6,721


$16,887

 

$33,255


$43,037

Income (loss) from operations
 
 
 
 
 
Piping Systems

$1,096


$9,403

 

$12,896


$21,276

Filtration Products
(726
)
(486
)
 
(1,300
)
(468
)
Corporate
(1,606
)
(2,130
)
 
(5,328
)
(6,715
)
Total

($1,236
)

$6,787

 

$6,268


$14,093