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Inventories (Narrative) (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Inventory [Line Items] |  |
Goods in transit | $ 2.1 | $ 0.1
Obsolete inventory due to product integration | $ 0.8 |

X
- Definition Inventory specific reserve for obsolete product due to line integration. + References No definition available. + Details
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Namespace Prefix: | ppsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition Gross amount of merchandise or supplies to which the entity holds the title but does not hold physical possession because the goods are currently being transported. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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