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Note 11- Related Party Transactions (Detail) (USD $) | Mar. 30, 2012 | Jun. 30, 2013 Officer and director sqft
--- | --- | ---
Area of Real Estate Property |  | 5,000
Facility charges | $ 700 |

X
- Definition Represents facility charges payable for use of resources. + References No definition available. + Details
Name: | pwvi_FacilityCharges
Namespace Prefix: | pwvi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant