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Components of the net deferred income tax asset (liability) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Deferred income tax asset: |  |
Net operating loss carry forwards | $ 2,307,440pwvi_NetOperatingLossCarryForwards | $ 2,092,216pwvi_NetOperatingLossCarryForwards
Start-up cost | 350,834pwvi_StartUpCost | 381,070pwvi_StartUpCost
Goodwill | 805,100pwvi_Goodwill2 | 871,272pwvi_Goodwill2
Amortization of Intellectual Property | (6,893)pwvi_AmortizationOfIp | (6,893)pwvi_AmortizationOfIp
Stock based compensation | 621,858pwvi_StockBasedCompensation4 | 542,836pwvi_StockBasedCompensation4
Other | 131pwvi_OtherAssets1 | 1,653pwvi_OtherAssets1
Deferred tax assets | 4,078,470pwvi_DeferredTaxAssets | 3,882,154pwvi_DeferredTaxAssets
Less Valuation Allowance | (4,078,470)pwvi_LessValuationAllowance | (3,882,154)pwvi_LessValuationAllowance
Net deferred tax assets after valuation allowance | $ 0pwvi_NetDeferredTaxAssetsAfterValuationAllowance | $ 0pwvi_NetDeferredTaxAssetsAfterValuationAllowance

X
- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References No definition available. + Details
Name: | pwvi_AmortizationOfIp
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments). + References No definition available. + Details
Name: | pwvi_DeferredTaxAssets
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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_Goodwill2
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition For each period for which an income statement is required, disclosure of the changes in the allowance, including balances at end of period. + References No definition available. + Details
Name: | pwvi_LessValuationAllowance
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer. + References No definition available. + Details
Name: | pwvi_NetDeferredTaxAssetsAfterValuationAllowance
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References No definition available. + Details
Name: | pwvi_NetOperatingLossCarryForwards
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate carrying amounts, as of the balance sheet date, of assets not separately disclosed in the balance sheet. + References No definition available. + Details
Name: | pwvi_OtherAssets1
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total amount costs incurred during the period and either capitalized or charged against earnings. + References No definition available. + Details
Name: | pwvi_StartUpCost
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References No definition available. + Details
Name: | pwvi_StockBasedCompensation4
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration