Annual report pursuant to Section 13 and 15(d)

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

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Oil and Gas Activities - Costs Incurred in Oil and Gas Property Acquisition, Exploration and Development Activities (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved $ 7,240 $ 380 $ 13,456
Unproved 4,732 150  
Exploration Costs 2,198 4,761 1,841
Development Costs 2,779 1,975 1,742
Total, including asset retirement obligation 16,949 7,266 17,039
United States
      
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved 1,606 380 13,456
Unproved 945 150  
Exploration Costs 2,192 762 0
Development Costs 2,779 1,971 314
Total, including asset retirement obligation 7,522 3,263 13,770
Australia
      
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved 5,634 0 0
Unproved 3,787 0  
Exploration Costs 1 976 714
Development Costs 0 4 1,428
Total, including asset retirement obligation 9,422 980 2,142
United Kingdom
      
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved 0 0 0
Unproved 0 0  
Exploration Costs 5 3,023 1,127
Development Costs 0 0 0
Total, including asset retirement obligation $ 5 $ 3,023 $ 1,127