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Weichai Transactions - Weichai Collaboration Arrangement (Details)	Mar. 20, 2017
Equity [Abstract]
Term of collaborative arrangement	3 years

X

- Definition

Collaborative Arrangement, Term

+ References

No definition available.

+ Details

Name:	psix_CollaborativeArrangementTerm
Namespace Prefix:	psix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_EquityAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration