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Restricted Stock Plan (Summary Of Pre-Tax Compensation Expense) (Details) (USD $)
 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 165,111us-gaap_RestrictedStockExpense $ 127,976us-gaap_RestrictedStockExpense
Performance Based Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense 64,174us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember		 72,695us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_PerformanceBasedRestrictedStockMember
Non Performance Based Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Compensation expense $ 100,937us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember		 $ 55,281us-gaap_RestrictedStockExpense
/ us-gaap_AwardTypeAxis
= phx_NonPerformanceBasedRestrictedStockMember