Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.5.0.2
Fair Value Measurements (Details) - USD ($)
 3 Months Ended
Sep. 30, 2016
Jun. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available-for-sale $ 1,898,000 $ 601,000
Rolling gross production average 60 days  
One Stone Exchange Agreement    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Asset impairment charges $ 11,300,000  
Impairment of proved oil and gas properties 7,800,000  
Accounts Receivable, Impairment Charges 100,000  
Exploration costs previously capitalized 3,400,000  
Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available-for-sale 1,898,000 601,000
Contingent consideration payable 0 0
Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available-for-sale 1,898,000 601,000
Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration payable $ 0 $ 0