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Note 4 - Revenue Recognition (Details Textual)	3 Months Ended
	Apr. 30, 2019
Costs Incurred for Uncompleted Contracts, Anticipated Collection Period	1 year

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