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Business segment reporting
 6 Months Ended
Jul. 31, 2017
Segment reporting [Line Items]  
Segment Reporting Disclosure [Text Block]
Business segment reporting. As of January 31, 2016, PPIH is engaged in the manufacture and sale of products in one segment: Piping Systems. As described below, prior to January 29, 2016, the Company was also engaged in the manufacture and sale of products in the Filtration Products segment. Piping Systems engineers, designs, manufactures and sells specialty piping, leak detection and location systems. This segment's specialty piping systems include (i) industrial and secondary containment piping systems for transporting chemicals, hazardous fluids and petroleum products, (ii) insulated and jacketed district heating and cooling piping systems for efficient energy distribution to multiple locations from central energy plants, and (iii) oil and gas gathering flow and long lines for oil and mineral transportation. Piping Systems' leak detection and location systems are sold with many of its piping systems and on a stand-alone basis, to monitor areas where fluid intrusion may contaminate the environment, endanger personal safety, cause a fire hazard, impair essential services or damage equipment or property.

Prior to January 29, 2016, the Company had a Filtration Products segment. This business is reported as discontinued operations in the consolidated financial statements. For further information, see "Notes to Consolidated Financial Statements, Note 4 Discontinued operations".

For the three months ended July 31, 2017 and 2016, no individual customer accounted for 10% or more of the Company's consolidated net sales. For the six months ended July 31, 2017, no individual customer accounted for 10% or more of the Company's consolidated net sales, and for the six months ended July 31, 2016, one customer accounted for 11% of the Company's consolidated net sales.

At July 31, 2017, one customer accounted for 20% of accounts receivable. Two customers accounted for 33% of accounts receivable at January 31, 2017.

 
Three Months Ended July 31,
 
Six Months Ended July 31,
 
2017

2016

 
2017

2016

Net sales
 
 
 
 
 
Piping Systems

$26,852


$22,859

 

$50,353


$45,928

Gross profit
 
 
 
 
 
Piping Systems

$3,058


$2,980

 

$4,843


$4,972

Loss from operations
 
 
 
 
 
Piping Systems

$62


($714
)
 

($1,397
)

($2,415
)
Corporate

($2,167
)

($1,476
)
 
(4,525
)
(4,375
)
Total loss from operations

($2,105
)

($2,190
)
 

($5,922
)

($6,790
)