Annual report pursuant to Section 13 and 15(d)

Oil and Gas Activities (Unaudited) - Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities (Details)

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Oil and Gas Activities (Unaudited) - Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved $ 0 $ 0
Unproved 0 0
Exploration Costs 311 1,563
Development Costs 338 8,023
Total, including asset retirement obligation 649 9,586
United States    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 0
Unproved 0 0
Exploration Costs 162 1,079
Development Costs 338 7,749
Total, including asset retirement obligation 500 8,828
Australia    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 0
Unproved 0 0
Exploration Costs 53 91
Development Costs 0 0
Total, including asset retirement obligation 53 91
United Kingdom    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 0
Unproved 0 0
Exploration Costs 96 393
Development Costs 0 274
Total, including asset retirement obligation $ 96 $ 667