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, 2013
Jun. 30, 2012
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved $ 3,399 $ 7,240
Unproved 671 4,732
Exploration Costs 8,267 2,198
Development Costs 2,045 2,779
Total, including asset retirement obligation 14,382 16,949
United States
    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 3,399 1,606
Unproved 157 945
Exploration Costs 398 2,192
Development Costs 2,045 2,779
Total, including asset retirement obligation 5,999 7,522
Australia
    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 5,634
Unproved 179 3,787
Exploration Costs 4,169 1
Development Costs 0 0
Total, including asset retirement obligation 4,348 9,422
United Kingdom
    
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]    
Proved 0 0
Unproved 335 0
Exploration Costs 3,700 5
Development Costs 0 0
Total, including asset retirement obligation $ 4,035 $ 5