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Acquisitions (Summary of Acquisitions) (Details) (USD $) | 0 Months Ended | 3 Months Ended | 0 Months Ended |
--- | --- | --- | --- | ---
Dec. 02, 2014 | Mar. 31, 2015 | Jan. 16, 2015 | Dec. 31, 2014
Purchase Price Allocation |  |  |  |
Goodwill |  | $ 10,624,000 us-gaap_Goodwill |  | $ 9,606,000 us-gaap_Goodwill
Net assets acquired |  | 3,140,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet |  |
Titan Energy Worldwide Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Name of Acquired Entity |  | Titan Energy Worldwide, Inc. |  |
Business acquisition, effective date of acquisition |  | Dec. 02, 2014 |  |
Business combination location within acquiree's segment |  | Critical Power |  |
Business combination primary form of consideration |  | Cash/stock |  |
Purchase Price |  |  |  |
Cash consideration | 953,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Common stock consideration | 1,005,000 us-gaap_BusinessCombinationConsiderationTransferredOther1 / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Purchase Price Allocation |  |  |  |
Current assets, including cash and cash equivalents | 3,721,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Property, plant and equipment | 410,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Identifiable intangible assets | 5,147,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Goodwill | 2,719,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Total assets acquired | 11,997,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Current liabilities | (6,881,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Notes payable | (3,158,000)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Net assets acquired | 1,958,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember | 1,958,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |
Cash and cash equivalents | 100,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = ppsi_TitanEnergyWorldwideIncorporatedMember |  |  |
Harmonics Holdings Inc. [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Acquisition, Name of Acquired Entity |  | Harmonics Holdings Inc. |  |
Business acquisition, effective date of acquisition |  | Jan. 16, 2015 |  |
Business combination location within acquiree's segment |  | T&D Solutions |  |
Business combination primary form of consideration |  | Seller note/debt forgiveness |  |
Purchase Price |  |  |  |
Cash consideration |  |  | 93,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |
Purchase Price Allocation |  |  |  |
Current assets, including cash and cash equivalents |  |  | 21,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |
Property, plant and equipment |  |  | 4,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |
Goodwill |  |  | 1,177,000 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |
Total assets acquired |  |  | 1,202,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |
Net assets acquired |  | 1,182,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember | 1,202,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |
Cash and cash equivalents |  | 0 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember |  |
Harmonics Holdings Inc. [Member] | Forgiveness Trade Payables and Indebtedness to Purchaser [Member] |  |  |  |
Purchase Price |  |  |  |
Business combination, separately recognized transactions, assets recognized |  |  | 609,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = ppsi_ForgivenessTradePayablesAndIndebtednessToPurchaserMember |
Harmonics Holdings Inc. [Member] | Deferred Purchase Price Due To Seller [Member] |  |  |  |
Purchase Price |  |  |  |
Business combination, separately recognized transactions, assets recognized |  |  | $ 500,000 us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAssetsRecognized / us-gaap_BusinessAcquisitionAxis = ppsi_HarmonicsHoldingsIncorporatedMember / us-gaap_BusinessCombinationSeparatelyRecognizedTransactionsAxis = ppsi_DeferredPurchasePriceDueToSellerMember |

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