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Business segment reporting
 6 Months Ended
Jul. 31, 2015
Segment reporting [Line Items]  
Segment Reporting Disclosure [Text Block]
Business segment reporting. The Company has two reportable segments: Piping Systems, which engineers, designs, manufactures and sells specialty piping, leak detection and location systems, and Filtration Products, which manufactures custom-designed industrial filtration products to remove particulates from air and other gas streams.

For the three months ended July 31, 2015 and July 31, 2014, no customer accounted for 10% of the Company's consolidated net sales. For the six months ended July 31, 2015, no customer accounted for 10% of the Company's consolidated net sales and for the six months ended July 31, 2014, one customer in Piping Systems accounted for 14% of the Company's consolidated net sales.

At July 31, 2015, one customer in Piping Systems accounted for 23% of accounts receivable. At January 31, 2015, one customer in Piping Systems accounted for 31% of accounts receivable.

 
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