Annual report pursuant to Section 13 and 15(d)

Oil and Gas Activities - Net Changes in Capitalized Costs That Are Not Being Depleted Pending Determination of Proved Reserves (Details)

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Oil and Gas Activities - Net Changes in Capitalized Costs That Are Not Being Depleted Pending Determination of Proved Reserves (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2010
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]      
Balance at beginning of year $ 8,085 $ 4,305 $ 6,641
Additions to capitalized costs 9,973 4,109 922
Assets sold or held for sale (150) 0 (3,072)
Reclassified to producing properties (3,772) (277) 0
Charged to expense (3,403) 4 (232)
Exchange adjustment 102 (56) 46
Balance at end of year 10,835 8,085 4,305
United States
      
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]      
Balance at beginning of year 2,411 314 0
Additions to capitalized costs 4,631 2,406 314
Assets sold or held for sale (150) 0 0
Reclassified to producing properties (3,772) (277) 0
Charged to expense (1,297) (32) 0
Exchange adjustment 0 0 0
Balance at end of year 1,823 2,411 314
Australia
      
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]      
Balance at beginning of year 415 415 3,487
Additions to capitalized costs 3,973 0 0
Assets sold or held for sale 0 0 (3,072)
Reclassified to producing properties 0 0 0
Charged to expense 0 0 0
Exchange adjustment 0 0 0
Balance at end of year 4,388 415 415
United Kingdom
      
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items]      
Balance at beginning of year 5,259 3,576 3,154
Additions to capitalized costs 1,369 1,703 608
Assets sold or held for sale 0 0 0
Reclassified to producing properties 0 0 0
Charged to expense (2,106) 36 (232)
Exchange adjustment 102 (56) 46
Balance at end of year $ 4,624 $ 5,259 $ 3,576