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Business segment reporting
 3 Months Ended
Apr. 30, 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 April 30, 2015, no customer accounted for 10% of the Company's consolidated net sales. For the three months ended April 30, 2014, one customer in Piping Systems accounted for 21% of the Company's consolidated net sales.

At April 30, 2015, one customer in Piping Systems accounted for 28% of accounts receivable. At January 31, 2015, one customer in Piping Systems accounted for 31% of accounts receivable.

 
Three Months Ended April 30,
 
2015

2014

Net sales
 
 
Piping Systems

$20,277


$42,354

Filtration Products
17,397

17,170

Total

$37,674


$59,524

Gross profit
 
 
Piping Systems

$2,355


$13,458

Filtration Products
1,686

2,531

Total

$4,041


$15,989

(Loss) income from operations
 
 
Piping Systems

($1,426
)

$8,017

Filtration Products
(1,230
)
(544
)
Corporate
(2,144
)
(1,764
)
Total

($4,800
)

$5,709