Regulatory Matters (Details) (Tennessee Regulatory Authority [Member], USD $)	Apr. 30, 2013
Tennessee Regulatory Authority [Member]
Schedule Of Regulatory Matters [Line Items]
Request Transfer Plant Held For Future Use To Deferred Regulatory Asset	$ 6,700,000

Amount of capital costs, currently held in "Plant held for future use" in the Consolidated Balance Sheets. We are seeking authority from the regulatory commission to suspend the petition to transfer costs to a deferred regulatory account in order to incorporate into a future regulatory proceeding.

No definition available.

Name:	pny_RequestTransferPlantHeldForFutureUseToDeferredRegulatoryAsset
Namespace Prefix:	pny_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant