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Note 3 (Details)	Sep. 30, 2017 Rate
Subsidiary Ownership [Abstract]
Equity Method Investment, Ownership Percentage	100.00%

X

- Definition

Subsidiary Ownership [Abstract]

+ References

No definition available.

+ Details

Name:	px_SubsidiaryOwnershipAbstract
Namespace Prefix:	px_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	us-gaap_MinorityInterestOwnershipPercentageByParent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant