Capitalized Costs (Details) - USD ($)	Mar. 31, 2017	Sep. 30, 2016
Extractive Industries [Abstract]
Cost of Non-Producing Oil and Natural Gas Properties	$ 0	$ 5,917

Cost of non-producing oil and natural gas properties.

No definition available.

Name:	phx_CostOfNonProducingOilAndNaturalGasProperties
Namespace Prefix:	phx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant