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Debt (Narrative) (Nexus Promissory Note) (Details) (GE Cf Mexico (Term Loan Agreement) [Member], USD $)	3 Months Ended
	Mar. 31, 2015	Jul. 25, 2012
Note issued		$ 1,650,000us-gaap_DebtInstrumentFaceAmount
Term loan frequency of periodic payment	60 consecutive monthly installments
Rate of interest of debt instrument		6.93%us-gaap_DebtInstrumentInterestRateStatedPercentage
Term Loan Facility [Member]
Long-term Debt	500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = ppsi_GeCfMexicoTermLoanAgreementMember / us-gaap_LongtermDebtTypeAxis = ppsi_TermLoanFacilityMember

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

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- Definition

Description of the frequency of periodic payments (monthly, quarterly, annual).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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- Definition

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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