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
Dec. 31, 2016
Jun. 30, 2016
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved oil and gas properties $ 29 $ 32
Wells in progress 332 337
United Kingdom    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Unproved oil and gas properties 29 32
Wells in progress $ 332 $ 337