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Business segment (Tables)
 6 Months Ended
Jul. 31, 2015
Business segment reporting [Abstract]  
Business segment reporting [Table Text Block]
 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2015

2014

 
2015

2014

Net sales
 
 
 
 
 
Piping Systems

$25,147


$33,789

 

$45,424


$76,143

Filtration Products
14,914

19,581

 
32,311

36,751

Total

$40,061


$53,370

 

$77,735


$112,894

Gross profit
 
 
 
 
 
Piping Systems

$3,126


$7,846

 

$5,481


$21,304

Filtration Products
2,534

2,699

 
4,220

5,230

Total

$5,660


$10,545

 

$9,701


$26,534

(Loss) income from operations
 
 
 
 
 
Piping Systems

($825
)

$3,783

 

($2,251
)

$11,800

Filtration Products
55

(30
)
 
(1,175
)
(574
)
Corporate
(1,705
)
(1,958
)
 
(3,849
)
(3,722
)
Total

($2,475
)

$1,795

 

($7,275
)

$7,504