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Note 11 - Stock Rights (Details Textual)	12 Months Ended
	Jan. 31, 2019 $ / shares
Price of PPIH Common Stock With Right	$ 25
Days to Wait After a Person Or Group Acquires 15% of Common Stock	10 days
Change in Control Percentage	15.00%
Redemption Price Per Right	$ 0.01

X

- Definition

The change in control percentage.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of days to wait after a person or group acquires 15% of common stock.

+ References

No definition available.

+ Details

Name:	ppih_DaysToWaitAfterAPersonOrGroupAcquires15OfCommonStock
Namespace Prefix:	ppih_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The Price of PPIH common stock with Right.

+ References

No definition available.

+ Details

Name:	ppih_PriceOfPpihCommonStockWithRight
Namespace Prefix:	ppih_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The redemption price per right.

+ References

No definition available.

+ Details

Name:	ppih_RedemptionPricePerRight
Namespace Prefix:	ppih_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration