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, unless otherwise specified
12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved $ 1,729 $ 3,399
Unproved 8 492
Exploration Costs 3,484 7,907
Development Costs 21,725 2,045
Total, including asset retirement obligation 26,946 13,843
United States
   
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 1,729 3,399
Unproved 8 157
Exploration Costs 541 398
Development Costs 21,174 2,045
Total, including asset retirement obligation 23,452 5,999
Australia
   
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 0
Unproved 0 0
Exploration Costs 436 3,809
Development Costs 0 0
Total, including asset retirement obligation 436 3,809
United Kingdom
   
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 0
Unproved 0 335
Exploration Costs 2,507 3,700
Development Costs 551 0
Total, including asset retirement obligation $ 3,058 $ 4,035