Subsequent Events (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Subsequent Events [Abstract]
Long-term debt, net of current maturities, related parties	$ 4,800	$ 25,000

Long-Term Debt, Excluding Current Maturities, Related Parties

No definition available.

Name:	psix_LongTermDebtExcludingCurrentMaturitiesRelatedParties
Namespace Prefix:	psix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant