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Restricted Stock Plan (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2015
Mar. 31, 2014
Mar. 04, 2015
Mar. 05, 2014
Mar. 11, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense $ 366,132us-gaap_RestrictedStockExpense $ 134,198us-gaap_RestrictedStockExpense $ 531,243us-gaap_RestrictedStockExpense $ 262,174us-gaap_RestrictedStockExpense      
Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Restricted Stock vesting period         3 years    
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
Non Performance Based Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense 111,000us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
56,613us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
211,937us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
111,894us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
     
Non Performance Based Restricted Stock [Member] | Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded         11,828phx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAwarded
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
   
Fair value of shares awarded         213,969us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
   
Non Performance Based Restricted Stock [Member] | Non Employee Director [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded         10,200phx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAwarded
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= phx_NonEmployeeDirectorMember
   
Fair value of shares awarded         210,018us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= phx_NonEmployeeDirectorMember
   
Performance Based Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Compensation expense 255,132us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
77,585us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
319,306us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
150,280us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
     
Performance Based Restricted Stock [Member] | Officer [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares awarded         35,485phx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAwarded
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
   
Fair value of shares awarded         349,399us-gaap_StockIssuedDuringPeriodValueRestrictedStockAwardGross
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
   
Compensation expense         196,800us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember