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Note 12- Related Party Transactions (Detail) (USD $)	Mar. 31, 2012	Dec. 31, 2012 Officer and director sqft
Area of Real Estate Property		5,000
Facility charges	$ 700

Represents facility charges payable for use of resources.

No definition available.

Name:	pwvi_FacilityCharges
Namespace Prefix:	pwvi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Area of a real estate property.

No definition available.

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	num:areaItemType
Balance Type:	na
Period Type:	instant