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ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES - Allownace and Oil and Gas Properties (Details)
$ in Thousands
12 Months Ended
Jun. 30, 2016
USD ($)
bbl
Jun. 30, 2015
USD ($)
Mar. 31, 2017
bbl
Jun. 30, 2013
bbl
Oil and Gas Properties        
Gain or loss recorded for oil and natural gas properties | $ $ 0      
Average period over which oil and natural gas price is based to derive future net revenue 12 months      
Discount percentage 10.00%      
Proved reserves | bbl 0      
Amortization of proved oil and gas properties subject to the full-cost ceiling test | $ $ 14,300 $ 0    
Guinea concession        
Oil and Gas Properties        
Proved reserves | bbl     0 0