Annual report pursuant to Section 13 and 15(d)

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

v3.5.0.2
Supplemental Oil and Gas Information (Unaudited) - Proved Reserves Quantities (Details) - MBbls
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Proved Developed and Undeveloped Reserves [Abstract]      
Revision of previous estimates (1,284) (3,417,000)  
Adjustment due to suspension of the Company's workover program (643)    
Removal proved undeveloped reserves from the classification of proved reserves due to uncertainty   3,083,000  
Oil (in Mbbls)      
Proved Developed and Undeveloped Reserves [Abstract]      
Adjustment due to suspension of the Company's workover program     (643)
United States | Oil (in Mbbls)      
Proved Developed and Undeveloped Reserves [Abstract]      
Beginning Balance 2,239,600 5,735,700  
Revision of previous estimates (1,284,400) (3,417,100)  
Production (60,200) (79,000)  
Ending Balance 895,000 2,239,600  
Proved developed reserves 895,000 2,239,600  
Proved undeveloped reserves (volume) 0 0