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Restricted Stock Plan (Narrative) (Details) (2010 Stock Plan [Member])
Mar. 05, 2014
Mar. 11, 2010
2010 Stock Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Common stock authorized 500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= phx_Plan1Member
200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= phx_Plan1Member