Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies (Narrative) (Details)

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Commitments and Contingencies (Narrative) (Details)
 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2016
defendant
Feb. 09, 2016
defendant
Mar. 11, 1997
Mar. 31, 2018
USD ($)
well
Mar. 31, 2017
USD ($)
Jul. 29, 2016
complaint
Dec. 31, 1997
USD ($)
well
Commitments [Line Items]              
Plugging and abandonment trust on the WCBB properties       $ 3,100,000      
Number of claims filed | complaint           2  
Judicial District Court for the Parish of Cameron              
Commitments [Line Items]              
Number of defendants | defendant   26          
Judicial District Court for the Parish of Vermillion              
Commitments [Line Items]              
Number of defendants | defendant 40            
Loss on long-term purchase commitment | Muskie Proppant LLC              
Commitments [Line Items]              
Non-utilization fees, accrued damages year to date       $ 885,000 $ 0    
Minimum              
Commitments [Line Items]              
Operating lease, term (in years)       1 year      
WCBB              
Commitments [Line Items]              
Remaining interest in oil and gas property acquisition, percent             50.00%
Payments of seller's obligation to contribute             $ 18,000
Minimum number of wells to be plugged | well             20
Tenure of minimum wells to be plugged (in years)     20 years        
Number of wells plugged | well       551      
Purchase commitment              
Commitments [Line Items]              
Future minimum commitments       $ 26,200,000