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Other Expense (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Other Nonoperating Income (Expense) [Abstract]
Waivers of interest and penalties	$ 400

X

- Definition

The amount for waivers of payroll tax obligations for interest and penalties.

+ References

No definition available.

+ Details

Name:	ppsi_WaiversOfInterestAndPenalties
Namespace Prefix:	ppsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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