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Acquisition - Fair values of assets (Details) (USD $) | Dec. 31, 2014
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Acquisition - Cornerstone Acquisition - Purchase Price Allocation |
Intangible asset - Intellectual Property | $ 659,440pwvi_IntangibleAssetIntellectualProperty1
Goodwill | 2,637,760pwvi_Goodwill1
Total assets acquired | 3,297,200pwvi_TotalAssetsAcquired
Aggregate purchase price | $ 3,297,200pwvi_AggregatePurchasePrice

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- Details
Name: | pwvi_AcquisitionCornerstoneAcquisitionPurchasePriceAllocationAbstract
Namespace Prefix: | pwvi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Aggregate purchase price The fair value of assets acquired in noncash investing or financing activities. + References No definition available. + Details
Name: | pwvi_AggregatePurchasePrice
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
Name: | pwvi_Goodwill1
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Intangible asset - Intellectual Property + References No definition available. + Details
Name: | pwvi_IntangibleAssetIntellectualProperty1
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The fair value of assets acquired in noncash investing or financing activities. + References No definition available. + Details
Name: | pwvi_TotalAssetsAcquired
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant