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Business segment reporting
 9 Months Ended
Oct. 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 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 October 31, 2017, no individual customer accounted for 10% or more of the Company's consolidated net sales, and for the three months ended October 31, 2016 one customer accounted for 17.0% of the Company's consolidated net sales. For the nine months ended October 31, 2017 and 2016, no individual customer accounted for 10% or more of the Company's consolidated net sales.

At October 31, 2017, one customer accounted for 19% of all accounts receivable. Two customers accounted for 33% of all accounts receivable at January 31, 2017.

 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2017

2016

 
2017

2016

Net sales
 
 
 
 
 
Piping Systems

$27,498


$25,302

 

$77,851


$71,230

Gross profit
 
 
 
 
 
Piping Systems

$3,320


$3,697

 

$8,163


$8,669

Income (loss) from operations
 
 
 
 
 
Piping Systems

($428
)

$640

 

($1,825
)

($1,775
)
Corporate

($1,863
)

($1,815
)
 
(6,388
)
(6,190
)
Total loss from operations

($2,291
)

($1,175
)
 

($8,213
)

($7,965
)