Quarterly report pursuant to Section 13 or 15(d)

Oil and Gas Activities (Details)

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Oil and Gas Activities (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Jun. 30, 2015
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved oil and gas properties $ 20,851 $ 20,857
Unproved oil and gas properties 700 709
Wells in progress 19,951 19,660
United States    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved oil and gas properties 20,851 20,857
Less accumulated depletion, depreciation, and amortization (4,481) (4,355)
Total net proved oil and gas properties 16,370 16,502
Unproved oil and gas properties 468 468
Wells in progress 18,880 18,560
United Kingdom    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved oil and gas properties 232 241
Wells in progress 1,071 1,100
Australia    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved oil and gas properties $ 0 $ 0