Annual report pursuant to Section 13 and 15(d)

Supplemental Oil and Gas Information (Unaudited) - Proved Reserves Quantities (Details)

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Supplemental Oil and Gas Information (Unaudited) - Proved Reserves Quantities (Details)
 12 Months Ended
Jun. 30, 2014
well
Jun. 30, 2013
drilling_rig
well
Proved Developed and Undeveloped Reserves [Abstract]    
Number of PUD wells removed from projections (7) (4)
Number of wells planned for drilling   16
Number of wells for infill drilling program   20
Number of wells in drilling program 9  
Number of wells recently drilled for CO2EOR pilot project 5  
Number of drilling rigs utillized in PUD programs   2
Previously forecasted
    
Proved Developed and Undeveloped Reserves [Abstract]    
Number of drilling rigs utillized in PUD programs   1
Oil (in Mbbls)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 7,368,600 8,905,200
Revision of previous estimates (1,515,000) (1,215,700)
Sales of minerals in place 0  
Fiscal year ended June 30, 2014 (117,900) (320,900)
Proved Reserves, Ending Balance 5,735,700 7,368,600
Proved Developed Reserves (Volume) 2,494,600 1,581,500
Proved Undeveloped Reserves (Volume) 3,241,100 5,787,100
Gas (in MMcf)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 11,400 11,500
Revision of previous estimates 0 200
Sales of minerals in place (11,400) 0
Fiscal year ended June 30, 2014 0 (300)
Proved Reserves, Ending Balance 0 11,400
Proved Developed Reserves (Volume) 0 11,400
Proved Undeveloped Reserves (Volume) 0 0
United States | Oil (in Mbbls)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 7,368,600 8,905,200
Revision of previous estimates (1,515,000) (1,215,700)
Sales of minerals in place 0  
Fiscal year ended June 30, 2014 (117,900) (320,900)
Proved Reserves, Ending Balance 5,735,700 7,368,600
Proved Developed Reserves (Volume) 2,494,600 1,581,500
Proved Undeveloped Reserves (Volume) 3,241,100 5,787,100
Australia | Gas (in MMcf)
    
Proved Developed and Undeveloped Reserves [Abstract]    
Proved Reserves, Beginning Balance 11,400 [1] 11,500 [1]
Revision of previous estimates 0 [1] 200 [1]
Sales of minerals in place (11,400)  
Fiscal year ended June 30, 2014 0 [1] (300) [1]
Proved Reserves, Ending Balance 0 [1] 11,400 [1]
Proved Developed Reserves (Volume) 0 [1] 11,400 [1]
Proved Undeveloped Reserves (Volume) 0 [1] 0 [1]
[1] The amount of proved reserves applicable to Australia gas reflects the amount of gas committed to specific long term supply contracts.