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Supplemental Disclosures about Oil and Natural Gas Producing Properties (unaudited) - Narrative (Details) (USD $)
 12 Months Ended
Jun. 30, 2014
Boe
Jun. 30, 2013
Boe
Jun. 30, 2012
Boe
Jun. 30, 2011
Boe
Reserve Quantities [Line Items]        
Oil and natural gas property costs attributable to the recognition of asset retirement obligations $ 66,976 $ 65,575 $ 93,522  
Period Considered for Unweighted Arithmetic Average for Determining Reserve Volumes and Values 12 months      
Proved Developed and Undeveloped Reserves Energy Equivalents, Net 13,289,510 13,766,440 13,441,116 13,847,462
Period Considered for Determining Unweighted Arithmetic Average of First Day of Month, Commodity Prices 12 months      
Proved Developed and Undeveloped Reserves Energy Equivalents Revisions of Previous Estimates Increase (Decrease) (247,350) [1] 2,806,181 [2] (344,440)  
Proved Developed and Undeveloped Reserves Energy Equivalents Production 177,742 226,819 208,155  
Proved Developed and Undeveloped Reserves Energy Equivalents Sales of Minerals in Place 184,722 2,254,038    
[1] Significant reserve revisions occurred in the Delhi Field during fiscal 2014. As a result of an adverse fluid release event in the Field, certain oil reserves were reclassified from proved to an unproved category based on the operator's decision to defer CO2 injections in certain parts of the Field. There was a positive revision to estimated proved reserves of natural gas liquids and natural gas as a result of an improved design for the gas plant in the Delhi Field. The plant is expected to significantly increase recoveries of these products, particularly natural gas, which was not previously planned to be extracted from the injection volumes.
[2] A significant upward reserve revision occurred in the Delhi Field during fiscal 2013 as a result of (1) revised geological maps based on production results and acquired seismic data, (2) inclusion of an additional reservoir with similar features, production history and suitability for EOR, and (3) inclusion of natural gas processing at Delhi.