Note 4 - Revenue Recognition (Details Textual)	6 Months Ended
Jul. 31, 2019
Costs Incurred for Uncompleted Contracts, Anticipated Collection Period	1 year

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

No definition available.

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