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
Mar. 31, 2016
Jun. 30, 2015
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved oil and gas properties $ 219 $ 240
Wells in progress 1,029 1,100
United Kingdom    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved oil and gas properties 219 240
Wells in progress $ 1,029 $ 1,100