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Note 5 - Revenue Recognition (Details Textual)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018
Percent of Revenue from Contract With Customer, Including Assessed Tax	100.00%	100.00%
Costs Incurred for Uncompleted Contracts, Anticipated Collection Period	1 year
Specialty Piping Systems And Coating [Member]
Percent of Revenue from Contract With Customer, Including Assessed Tax	90.00%

X

- Definition

Represents the duration of time within which costs incurred for uncompleted contracts are anticipated to be collected.

+ References

No definition available.

+ Details

Name:	ppih_CostsIncurredForUncompletedContractsAnticipatedCollectionPeriod
Namespace Prefix:	ppih_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the percentage of revenue from contracts with customers that is attributable to a specified product or service.

+ References

No definition available.

+ Details

Name:	ppih_PercentOfRevenueFromContractWithCustomerIncludingAssessedTax
Namespace Prefix:	ppih_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_ProductOrServiceAxis=ppih_SpecialtyPipingSystemsAndCoatingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: