Quarterly report pursuant to Section 13 or 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
3 Months Ended 12 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Jun. 30, 2012
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Impairment of Oil and Gas Properties $ 890 $ 0  
Proved 27,962   28,187
Accumulated Depreciation, Depletion and Amortization, Property, Plant and Equipment, Period Increase (Decrease) (5,537)   (5,740)
Unproved 6,501   7,091
Exploration Costs 3,707   3,744
United States
     
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved 24,299   24,207
Unproved 104   104
Exploration Costs 1,773   1,718
Australia
     
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved 9,200   9,720
Unproved 4,461   4,389
Exploration Costs 0   0
United Kingdom
     
Costs Incurred, Oil and Gas Property Acquisition, Exploration, and Development Activities [Line Items]      
Proved 0   0
Unproved 1,936   2,598
Exploration Costs $ 1,934   $ 2,026