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Stockholders' Equity (Treasury Shares transactions) (Details) (USD $) | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Oct. 16, 2012 | May 31, 2012 | Apr. 30, 2012 | Apr. 07, 2011
Treasury Shares transactions |  |  |  |  |  |  |
Shares of the Company's stock were surrendered to Treasury in exchange for a interest-free note payable |  |  |  |  |  |  | 4,500,000pwvi_SharesOfTheCompanySStockWereSurrenderedToTreasuryInExchangeForAInterestFreeNotePayable
Amount reported as note payable to related party |  |  |  |  |  |  | $ 200,000pwvi_AmountReportedAsNotePayableToRelatedParty
Imputed rate of interest on note payable |  |  |  |  |  |  | 8.00%pwvi_ImputedRateOfInterestOnNotePayable
The balance of the note payable was settled with the surrender of an additional shares of the Company's stock |  |  |  | 3,000,000pwvi_TheBalanceOfTheNotePayableWasSettledWithTheSurrenderOfAnAdditionalSharesOfTheCompanySStock |  |  |
Value of note exchanged in Treasury |  |  |  | 530,000pwvi_ValueOfNoteExchangedInTreasury |  |  |
Company purchased shares of common stock from an affiliate |  |  |  |  | 450,000pwvi_CompanyPurchasedSharesOfCommonStockFromAnAffiliate | 100,000pwvi_CompanyPurchasedSharesOfCommonStockFromAnAffiliate |
Purchase price of shares of common stock purchased from an affiliate |  |  |  |  | $ 90,000pwvi_PurchasePriceOfSharesOfCommonStockPurchasedFromAnAffiliate | $ 25,000pwvi_PurchasePriceOfSharesOfCommonStockPurchasedFromAnAffiliate |
Purchase price per share of common stock purchased from an affiliate |  |  |  |  | $ 0.20pwvi_PurchasePricePerShareOfCommonStockPurchasedFromAnAffiliate | $ 0.25pwvi_PurchasePricePerShareOfCommonStockPurchasedFromAnAffiliate |
Amount payable as equal monthly installments |  |  |  | 100,000pwvi_AmountPayableAsEqualMonthlyInstallments | 10,000pwvi_AmountPayableAsEqualMonthlyInstallments |  |
Balance of payable included in the "Payable to related parties" |  | 5,000pwvi_BalanceOfPayableIncludedInThePayableToRelatedParties | 33,000pwvi_BalanceOfPayableIncludedInThePayableToRelatedParties | 100,000pwvi_BalanceOfPayableIncludedInThePayableToRelatedParties | 10,000pwvi_BalanceOfPayableIncludedInThePayableToRelatedParties | 14,000pwvi_BalanceOfPayableIncludedInThePayableToRelatedParties |
Debt fully Paid | $ 100,000pwvi_DebtFullyPaid |  |  |  |  |  |

X
- Definition Amount payable as equal monthly installments + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount reported as note payable to related party + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Balance of payable included in the "Payable to related parties" + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Company purchased shares of common stock from an affiliate + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition Custom Element. + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Imputed rate of interest on note payable + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Purchase price of shares of common stock purchased from an affiliate + References No definition available. + Details
Name: | pwvi_PurchasePriceOfSharesOfCommonStockPurchasedFromAnAffiliate
Namespace Prefix: | pwvi_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Definition Purchase price per share of common stock purchased from an affiliate + References No definition available. + Details
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Namespace Prefix: | pwvi_
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Balance Type: | na
Period Type: | instant

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- Definition Shares of the Company's stock were surrendered to Treasury in exchange for a interest-free note payable + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:sharesItemType
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Period Type: | instant

X
- Definition The balance of the note payable was settled with the surrender of an additional shares of the Company's stock + References No definition available. + Details
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Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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

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- Definition Value of note exchanged in Treasury + References No definition available. + Details
Name: | pwvi_ValueOfNoteExchangedInTreasury
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant