Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

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Fair Value Measurements (Details) - USD ($)
 3 Months Ended 9 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available-for-sale $ 601,000 $ 601,000   $ 4,230,000
Rolling gross production average   60 days    
Exploration costs previously capitalized   $ 0 $ 20,000  
Recurring        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available-for-sale 601,000 601,000   4,230,000
Contingent consideration payable 0 0   0
Recurring | Level 1        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Securities available-for-sale 601,000 601,000   4,230,000
Recurring | Level 3        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration payable 0 $ 0   $ 0
One Stone Exchange Agreement        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of proved oil and gas properties 7,800,000      
Accounts Receivable, Impairment Charges 100,000      
Exploration costs previously capitalized 3,400,000      
Asset Impairment Charges $ 11,300,000